Free up space

Jun 27, 2018
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Q.1: How do I find out where the heck are all the Gbs being used?
Only have 600MB left , having used up 450GB already - except I only have very few softwares installed and no files saved to C drive (no photos, videos, etc)

Q.2: What is the best way to free up space?
I’ve manually deleted a whole bunch of unnecessary files / programs, ran disk clean up... Don’t know where to go from here...