Learn HTML in 15 minutes: a post with an embedded YouTube video:
When we “Add New Post” in WordPress, we copy the Embed-code from YouTube to insert the video into the Post:

Create a gallery with a custom lightbox
Since the addition of the blocks editor in WordPress, you can add a Lightbox to a gallery. However, the information in this article is still relevant if you would like to add you own Lightbox. Learn to create a gallery with a lightbox which allows you to click the image and view it in an … Continue reading Create a gallery with a custom lightbox