I know nothing about how to use godot or programming, but i like rpg maker, and i think its very easy to learn n use
however i know that in the future, if my will to make a 3d mmorpg still exists, i will leave rpg maker and use godot, since godot is a lot better than rpg maker, which is just easier and faster
ive seen on youtube a guy teaching how to make a topdown rpg 2d, he takes 2 hours to do something that you can do nearly the same in rpg maker in less than 10 minutes (he makes a abs/zelda battle system, while rpg maker standard is a pokemon firered/turn based battle system)
i dont think however that the diference will be that different when making more complex games

how much harder it is to learn godot n use it to make rpgs? how much + time will b used in the learning n game dev?

1 - like a zelda/pokémon game from nintendo ds
2 - like a breath of the wild
3 - like a world of warcraft/FF14

(my native language is brazilian portuguese, sorry)

Well, you got it about right when you watched that tutorial compared to rpg maker. What you are really making in rpg maker is a mod. All the battles and everything are already decided. In Godot you have to program it all. Not only that, but making 3d models for everything is a huge undertaking. I really don't know anyone that has finished anything but a simple game as a solo developer. I'm sure it can be done, but it would take a huge amount of work as those games were written by entire teams of people and they may have spent years on it. Just to have all the skills necessary is a daunting experience.