4 gate is the most stable and usable build in all 3 matchups...
if u wanna start, start with a 4gate...
as u said it urself, it isnt as steep as other protoss builds to learn n pickup 4 gate...

it doesnt require much scouting and it will hold off any possible attack from the opponent till 7-8min...
u cant expect a new player to play macro right off the bat when everytime he expands he die to a timing attack...
or when he tech, he lacks army (1 base colo any1? lol)...

once u get comfortable using defensive 4 gate (u can expand into anything), u will started to do offensive/ pressure 4 gate...
slowly u will cut down the number of gates if u are expanding (2-3 gate FE) or teching (immortals etc)...
as u do so, u start to scout ur opponent better and gained a better idea of timings...