I usually include a YouTube link when I post a question. But I want to embed YouTube videos. What should I do?
BSE does not have YT embeds on purpose.
It all comes down to two types of posts we are trying to avoid: Link only posts, and "fix this" posts. Adding a video embed would just worsen both problems.
A video embed does not fit well in the SE system. A post could too easily be totally dependent on the video (link only), which would just make the this kind of problem worse.
So what should you do? Write your question, then link to the youtube videos. Remember any external source (like youtube or blend-exchange) must be supplemental. Generally, a question should be understandable just from reading the question. If a video is really necessary to get the information across (in most cases it isn't), then by all means link to it. But under no circumstances should should your question be a video and "See video for the problem."
Same goes for answers. When you write an answer, write it first then link to the youtube video. Remember any external source (like youtube) must be supplemental. Your answer should still be helpful and understandable on its own, not dependent on any links. If a YT video helps get the information across better, then by all means link to it. But under no circumstances should a video be your answer.