First method:
Open up pubg and type "invincibility" while in game. 100% works trust me.
Second method:
Buy a fucking cheat you cheap fuck
Third method:
Take your time and learn how to code (which might take years and you will probably get bored after the first minute of watching a youtube tutorial) and write it yourself.
TADA you now have a fully working cheat.
This should really be a sticky tutorial for all the kids asking stupid shit like these.