Disclaimer
Using YouTube videos on your website is generally allowed, but it's important to consider potential copyright issues.
When uploading a video to YouTube, creators have the option to allow or disallow embedding of their content. If the "Share" button is enabled on a video, the creator has chosen to allow embedding, which means you can include the video on your website. However, if the "Share" button is disabled, you should not embed the video on your website without permission from the creator.
It's important to respect the wishes of content creators and only use embeddable videos on your website.