The fastest way to get a video explanation of a topic is to search YouTube with three things in the query: the topic, your level (GCSE, AP, first year university) and the word "explained" or "worked example". For school subjects, start with channels that teach to a syllabus, such as Khan Academy, CrashCourse or, for UK science, Free Science Lessons. If nothing fits, paste your notes into an AI assistant for a written step-by-step explanation, or turn your own notes into a short narrated video. Check any video against your textbook in the first two minutes: the right level and the right terms matter more than polish.

Where good explanations already live

Most topics a student is asked about have been explained well on video at least once. The trick is knowing which channels teach to an exam and which teach for curiosity. Both are useful, but only one will use the words your mark scheme uses.

Big-picture channels like Kurzgesagt are excellent for curiosity and weak for revision. They explain the idea, not the version an examiner wants written down. Watch them first if a topic feels alien, then move to a syllabus channel.

How to search so the right video comes up

YouTube ranks by what keeps people watching, not by what fits your course. A few habits fix most of that.

• Put your level in the query. "Osmosis" returns everything from a children's cartoon to a cell biology lecture. "Osmosis GCSE biology required practical" returns the video you actually need.
• Use the exact term from your course. If your syllabus says "citric acid cycle", search that, and also "Krebs cycle". Teachers and channels use different names for the same thing.
• Add "worked example" for anything with numbers. It filters out the videos that only describe a method.
• Use the filters. Under Filters you can limit by duration, which helps when you want a five-minute refresher rather than a ninety-minute lecture, and by subtitles, which matters if you want to paste a transcript into an assistant later.
• Check the upload date for anything that changes. Exam formats, software, tax rules and medical guidelines move. A 2014 video on an exam that has since been redesigned will teach you the old format.

Judge a video in the first two minutes

You do not need to watch the whole thing to know whether it will help. Before you commit, check these.

• The first two minutes use the terms your course uses, at the depth your course goes to.
• The speaker draws or shows the mechanism, not just slides of bullet points.
• The channel has a clear teaching focus: a teacher, a university, or a body of videos on the same subject.
• The comments do not point out a factual error in the first screenful.
• The length matches the job. A three-minute video cannot cover a whole unit; a forty-minute one should not be about a single definition.

If it fails two of these, move on. There are almost always more.

Asking an AI assistant for a video explanation

When people type "I want video explanation" into ChatGPT, Gemini or Claude, they usually want one of three things. Each gets a different answer.

"Explain this to me like a video would." All the assistants can do this well in text. Ask for a step-by-step explanation at your level, with one idea per step and a simple diagram described in words. This is often faster than finding a video at all, and you can ask follow-up questions, which you cannot do with a video.

"Find me a good video on this." Assistants with web search can suggest channels and searches, but they sometimes invent video titles or give links that go nowhere. Treat any specific video they name as a lead to check, not a fact.

"Make me a video." This is the one with the most confusion. A chat assistant like ChatGPT can write a script but does not turn it into a narrated, drawn explainer by itself; can ChatGPT make a video? goes through what it actually outputs. Google's Gemini can generate short video clips of around ten seconds, which are not explanations. NotebookLM, now called Gemini Notebook, can make a Video Overview: a narrated video, mostly illustrated slides, built from sources you upload, which works well for a summary of a reading. Dedicated document-to-video tools take your notes or script and make a narrated explainer you can edit scene by scene.

If you already have a video and want it broken down, that is a separate job, covered in can AI explain a whole video step by step.

When nothing fits: make your own

Sometimes the right video does not exist. The usual reasons are that your teacher uses a specific case study, your syllabus words something unusually, or every video on the topic is either a two-minute cartoon or a fifty-minute lecture. That is when making your own short video makes sense, and it is less work than it sounds because you already have the material: your notes, the slides, the textbook section.

Worked example: the demographic transition model with Nigeria as the case study

Say your geography course teaches the demographic transition model (DTM) and the case study your teacher chose is Nigeria. Plenty of videos explain the model. Few apply it to the country your exam will name. A short video of your own might run like this.

That is about 130 words of narration, so a little under a minute at 150 spoken words a minute. Every term in it is the term your course uses, and the case study is the one the exam will ask about. Before you rely on it, check the current birth rate, death rate and fertility figures against the source your teacher gave you; figures from different years disagree, and so do drafts.

Watching is not the same as knowing

A good video explanation makes a topic feel clear. That feeling fades by the next morning unless you test it. Pause before each new step and say what you think comes next, then write the explanation from memory once the video ends. The full method is in how to study from video instead of rereading notes. If your starting point is a lecture deck rather than notes, how to turn lecture slides into a study video shows how to put the missing explanation back first.

Make it

1. 1

   Search with your level and your course's term

   Topic plus level plus 'explained' or 'worked example'. Try one syllabus channel and one general channel, and judge each in the first two minutes.

2. 2

   If nothing fits, write down what is missing

   Your case study, your syllabus wording, the step every video skips. That list is the content of your own video.

3. 3

   Write a short script from your notes

   One idea per scene, two to four sentences each, in the words your course uses. Aim for one to five minutes, about 150 words per minute.

4. 4

   Paste it into openCanviz

   Set a target length, choose Keep my wording so your checked sentences become the narration, and pick whiteboard style so each diagram builds as you speak.

5. 5

   Check every label and figure

   Pause on each scene and compare it with your textbook. Drafted drawings can mislabel a stage or swap a number. Fix the scene before you watch it twice.

Common questions

Is there a free way to get a video explanation of my homework question? Yes. Search your exact topic with your level on YouTube first; Khan Academy and most syllabus channels are free. For a specific question, ask an assistant for a step-by-step written explanation and check it against your notes. Do not hand in either as your own work.

Why do I understand the video but still get the question wrong? Because watching someone solve a problem is different from solving it. Pause before each step and try it yourself, then compare. The gap between what you predicted and what the video does is exactly what you need to learn.

Can an AI assistant make a video from my notes? A chat assistant can turn your notes into a script but does not produce a narrated, drawn video on its own. Gemini Notebook's (formerly NotebookLM's) Video Overviews make narrated videos from uploaded sources, and document-to-video tools make an explainer from your notes that you can edit scene by scene.

How long should my own explanation video be? As short as the idea allows. One concept is one to three minutes. A whole topic is five to ten. Longer than that and you will not rewatch it.

What if the best video is in another language? Turn on subtitles and use auto-translate, which is rough but often enough to follow a diagram. Or make your own short version with the narration in your language.