Windows key problems

I am trying to reinstall windows on a new m.2 drive that I have and I cannot locate my product key. I bought a physical copy from best buy and it is on a flash drive, but I lost the box and am trying to locate the key. I seem to remember years back being able to look in my computer "properties"...

I built a new gaming pc over the black Friday sale and everything is going smoothly except for Windows which is causing some issues. I'm using Win 10 Pro and upon boot up, I get the Windows Activation message in the bottom corner, but upon diving in further, it says it's due to a "network"...

Forgive me first for being a noob about technology whatsoever. I used usual HDD in my notebook with Win10, 500 GB with 4 partitions: C: system, D: data, E: data, x: reserved for something from manufacturer Then I got a little SSD, 128 GB. I want to clone my HDD to SSD, and after cleaning and...