How to efficiently clean up disk space in windows 11?

There are a lot of good advice posts here by fello community peeps, however I alwyas just choose the easiest one first and that normally sorts the issue out:

Windows key + R (Run): cleanmgr.exe

Select the drive to clean

Once the app starts, very IMPORTANT to click the button "Clean up system files)

Select all the checkboxes of stuff you want to clear.  This will include old installs if Windows is finished with it.  

I've seen it recover many gigabytes

Good luck