What else do I have to consider when installing a new Windows?

I played Win10 on my laptop yesterday and updated all drivers so far, had problems with the Wi-Fi at first, but everything works now.
do I still have to pay attention to / download anything or is everything ready now?

anything else for the graphics card? (Gtx 1660ti)

The drivers for the graphics card, yes. Nvidia GeForce Experience.

Then there's java.

Don't forget the virus scanner, there are good free and paid ones, there are comparisons on the Internet.

The one included with Windows 10 also offers protection.