Firstly, Tap is not mac-based. Applevis obviously is but Tap can work on mac, ios, windows, and android.
Also, there are about 15 international keyboard maps last I checked.
space=tap all 5 fingers at once
delete=2, 3 and 4
To move the cursors, do one of two things:
voiceover mode: when using tap with an iPhone, you have actual combinations that mimic ctrl+option+whatever the gesture is. For example:
3-4: scroll right
1-2: scroll left
finger 2 double tap: conveniently, double tap
And the list goes on.
2: use the actual arrow key gestures: in number mode, you have gestures to control arrow key movements.
On iPhone, you have an interactive accessible tutorial for the tap alphabet and related gestures. I have asked about Android and they are actively working on making the Android version of the tutorial app accessible.
Trust me, the learning curve is not as steep as it seems.