Safe jumps

I just dont know the mechanics to safe jumping.

I know there is a game mechanics section somewhere but I cant find it.
Either i’m not searching correctly or I am mistaken.

If someone could point me in the right directions, that would be greatly appreciated.

http://sonichurricane.com/articles/sfterms.html#techsafejump

By the way I googled ‘safe jump sf4’ to get these.

fyi, game mechanics are on the matchup thread, post 9.