Windows 10. How do I best teach my pc?

I would like to empty my laptop of many programs and unnecessary things. However, do not lose pictures and so? What's the best way to do it?

Uninstall the programs that are no longer needed (Control Panel → Programs and Features). Delete your own data that is no longer needed (documents, music, pictures, videos, etc.).

Uninstall programs

if necessary, reinstall the operating system or upgrade to an SSD for me that sounds like an HDD

otherwise still a little Browse through folders

To uninstall the RevoUninstaller use.It also removes remaining registry entries: https://www.chip.de/...91156.html