Step One

Locate the video you want to embed into the webpage.

video source

Video from computer

video source

Video from Youtube

Step Two

Insert video into the proper code, or paste link from youtube.

video source

Video link in code, it is an mp4 video so the video type is "video/mp4".

video source

Pasted youtube embed, altering the height/width may cause the video to lose quality.

Step Three

Add in preload and boolean attributes

Examples
Preload="auto"
Loads video automatically
Preload="metadata"
Loads video info such as video length
Preload="none"
None of the file is loaded
Controls
adds in video controls
Autoplay
Automatically plays video once downloaded
Loop
Video will restart once ended
Mute
Video is automatically set to mute