As others (and internet memes hehehe) pointed out, be careful with Win10 updates and privacy issues. Updates might screw up your hardware drivers (although uncommon), and there's quite a lot new "user tracking" method added in Win 10
And watch out for buggy update releases too, because in 2018 they had a frantic software development management issues which made public quite angered at the time.
Also, older games that has "3D graphics acceleration" might break, because they use a legacy (and somewhat stupid) method to detect whether your graphic card supported it or not. (I'm looking at you, PopCap).
If you want to troubleshoot things yourself which involve the use of Command Prompt, beware that the default command line console has changed into Powershell. When you copy pasting fancy code from internet, you need to know which one is used.
From my observations, when launching a new program, CPU utilization might shoot up to 100% for a while, which rarely happened in Win 7 (at least mine). Don't panic,this is normal because nowadays they prioritize speed. Also memory management (I'm talking about RAM) is much better than Win 10 early days.
Aside from that, it's actually okay to transition to Windows 10. Most graphic software has added official support for Win 10, and software compatible to Windows 7 is highly likely to be compatible for Windows 10. Or... if you want total control of your computer, there's always Linux distro for you Eventually, I believe everybody will be, indirectly, forced to jump ship to Windows 10, because software makers will start to abandon support for Windows 7.....