One of the more neglected YouTube options out there is the use of transcripts (closed captions). With this, you can enter a script which contains everything that is said in your video completely verbatim, and it will all be crawled by YouTube, making it a big search factor. There's an importance placed on this due to how much it can benefit the viewers, particularly those who are hearing impaired, adding much more value to the video.

When you've uploaded a video, it will already have an automated transcript attribute to it, which actually plays a part in why you should create your own; it's largely incomprehensible gibberish and unrelated to your actual speech.

You're given two options when it comes to creating your own transcript; transcribe and sync or upload a file. The former is certainly preferred, considering that it will be automatically synced up with your speech, and is fortunately more reliable than the automated transcriptions. The latter is similar but will involve you actually doing the syncing process yourself by adding time stamps.

Here's the screen you'll be greeted with upon selecting "transcribe and sync":