How to make two parts join together?

In studio there is two tools, one called rotate and another called brick collision. Click on brick collision once and then 2 bricks can collide. Also the other tools rotate can be used for tilting objects or rotating.

CFraming, there are many scripts for this but I will teach you the simple way.

In your Studio, go to the button in your tool bar that looks like 2 pieces over lapping with a red dot in the middle. Click it so that it is not indented. This is called collisions.

The next time you move our re-size two bricks they will merge together.

Hope I helped :)