videos

resolution

360p is used for youtube.
480p is used for laptops and monitors.
720p is HD.
1080p is used for tv.

The numbers tells us the amount of lines on the screen.

on DVDs video and audio is separate but they are synced.

timeline compression=.m2v and .ac3 also known as dolby 2.0

audio=mp3

if video and audios is together it is called 'muxed' or 'mp4'

lassy 

once you compress a file you can't go back to how it was.

lassless

large files
more movement in bigger files.

rendering

there will be a button that looks like this ☰.

• work area bar 
• sequence
• render entire work area

• file
• export 
• media