What are the types of internal device mounts and types of buttons?

Question

Electronics

Good afternoon.
I am in the process of creating one device, I ran into the problem of fastening the halves of the case together.
(there are a couple of ideas, but there is no certainty that 3d printing is able to provide an acceptable level of strength).
It is also not very clear how to attach buttons to the case, what types of fasteners are.
Is there somewhere organized information on this topic in bourgeois or Russian?
PS
The buttons are plastic (let's say), returnable, like on an mp3 player.
3 buttons, 1x1 cm in size. They have approximately the same frequency of pressing. The possibility of single and multiple pressing, holding is required.

Answer 1

Hot glue - For centuries...