Question How can I use my current HDD in new mobo

[Zerk_Bubbles]

So I just got the new components to upgrade my PC but I didn't got a new hard drive because I'm dumb and didn't thought about that (it's my first build/big upgrade, new mobo, processor and RAM). I was looking for a way to use my HDD and found that the best way to do so is to do a backup and then format it. But how can do it? Just right click and then format? What do I have to do next to use and install it for the next mobo? How do I install Windows and the drives I need for the components? I'm gonna keep looking, but I also wanted to ask, thank you in advance c:
If it's a better solution I could just take it to someone to do it for me but I wanted to know how to do it myself, like I said I'm new to this and didn't wanted to screw this up
Some additional info that I saw was important is that I'm changing processors from AMD A10 to Ryzen 5 and the mobo from NVIDIA to Asus

 

[TouchPlayTV]

If you want to install windows on old drive you don't have to worry about it because when windows installation begins there will be a button that will allow you to compete format your HDD. At least i did like that when installing Windows 10. Good Luck!

 

[karenjoly]

I would take the parts to a local shop and ask if you can watch and learn as the technician sets up the system. Maybe next time do it yourself.