install windows on new ssd from old hdd

I had a similar issue with another old Dell laptop and was never able to do a clean windows install to an SSD. But here I have a Dell Inspiron 15 N5050, a 2012 I believe. I had previously cloned the old HDD to the SSD and it worked fine for a little over 2 years. But now it was giving problems...

I bought a new SSD and I wanna boot my pc onto it but I don't have windows 10 installed and no activation key😥 cause I can't afford it, but I have Windows 10 installed on my old HDD. Can I transfer Windows 10 to my new SSD and boot it? (but I still want my HDD Plugged in to my PC and...