how to change partitions

helle eHello everyone, I recently installed Ubuntu on my PC, and it works with a dual boot alongside Windows. I initially wanted to test it continuously, so I initialized the Ubuntu partitions on my HDD. But now I'm convinced I'll use it permanently, so I'd like to remove Windows and move the system files that require speed, like root, bin, swap, etc., to my SSD. However, I don't want to do anything rash, hence my request for your help. Thank you for your response.