I want to change this HDD with a SSD drive. How do I know which drive to look for? Do i need some kind of adapter or i just have to plug it?

Hi to all. I need help with more explanation since english is not my first language.

My problem is a broken screen. I can still use the iphone perfectly and everything works fine, i just have a cracked glass. Isnt there a way of only replacing the broken glass? If not, which guide should I follow and which replacement parts should I buy?

My confussion appears because there is a "Display Assembly Replacement" guide and the "Front Panel Replacement" guide, and i dont know which should i follow, if any of these two.

Thanks a lot!