PC Tech Thread

I have a POS desktop PC.
Currently it has an HDD, I would like to swap to an SSD, at least for the Windows installation.
The motherboard is old (Asus something with an A6 AMD 2.2ghz cpu)
Originally it had 4gb ram, which was upgrade to 10gb from a kind forumers donation, and soon will have another 16gb to play with (not sure what the limitations of the board are, so will be at least 16gb, possible more if it can take it)

My questions are:

1. I think the existing HDD is SATA, so I guess I need a SATA SSD? (do other mounts exist?)
   
2. Is it likely the motherboard will have multiple sockets for additional storage? I wouldn't mind keeping the old HDD as a storage device
   
3. Moving the Windows 10 installation from the HDD to the SSD, do I
   need to flash a fresh image and go through the "rigmarole" of a
   clean install, or is there an "easy" drag and drop option?
   
   

As I type these questions I feel like a bit of an idiot and should know better.