Adding a bit to what Jo*mar wrote:

The free version of CCleaner (https://www.piriform.com/ccleaner) is worth considering.

It does a good job of uninstalling unwanted programs (eg, bloatware).

Also, it is effective in deleting the cache (all of the temporary files from your browser and other applications) - I run once every few weeks - usually it gets rid of several GB of stuff that I don't need any more.

Note that CCleaner will delete any passwords which have been stored in the cache so make sure that you know all of your passwords before you run it.