This thread explains what footsies and spacing are and exactly why they are such strong fundamentals. They are fundamentals a lot of DOA players are lacking. A lot of players online lack it, even frown on it and deem it garbage simply because they refuse to admit they are being outplayed. And cannot utilize it well themselves. Even some tournament level players lack good footsies and spacing. And that's due to the fact it is always an overlooked skill set for everything...
Homework Time! Footsies and Spacing 101
Homework Time! Footsies and Spacing 101