LÖVE

In my games that I made myself, I add code that basically changes the objects y velocity by the games gravity variable which’s adds the y velocity to the y position of the object (unless the object is touching another object then it’s y velocity resets to zero which I have trouble figuring out )

Is there a better or at least easier solution to that?

If you want easier solution than implementing whole physics, you can take a look at love.physics module

Thats already a three lines solution. Hard to make it any easier.
Where is it troubling you?

You can google my Mars Lander on itch.io that has gravity and thrust and all those fun things. You'll probably be confused by that code. I know I am. 8-)

Love.physics is a full blown physics engine that takes some practice.

Sounds like you need to do some sort of bounding box type detection otherwise just apply downwards gravity * dt every cycle.