I currently have a HDD and I am switching to an SSD and a new HDD. What I was wondering is, what would be the best steps to take to have my already activated windows 10 on the SSD, and move the rest of the files to the new HDD fro the old HDD?
If you don't have your OS on a separate partition, you can connect your new drive as a secondary storage device (you'd have to initialize it via Disk Management before you're able to partition and format it) and transfer all the data you'll be needing - e.g. photos, videos, documents, projects, etc. in order to slim down the HDD's used capacity so that you can clone the drive.
If the OS is on a separate partition, you should be able to clone just the Windows associated partitions.
If you don't have your OS on a separate partition, you can connect your new drive as a secondary storage device (you'd have to initialize it via Disk Management before you're able to partition and format it) and transfer all the data you'll be needing - e.g. photos, videos, documents, projects, etc. in order to slim down the HDD's used capacity so that you can clone the drive.
If the OS is on a separate partition, you should be able to clone just the Windows associated partitions.