[SOLVED] How to properly have a fresh install of Windows 10 (deleting partitions)

Jul 25, 2019
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Recently i've come across an idea that in order to literally commit a completely fresh install of windows is to actually download it off of a external drive and delete any hard drive/ssd partitions other than one. I would like to potentially do this soon but I want to make sure I do it correctly, so here are my questions.
  1. Do I need to erase all of my files in order to have a fresh install of windows? If so how do I delete all of my files? Will simply doing a custom install and deleting previous partitions delete all my other data?
  2. Since I'm going to have to do this off of a USB Device personally, should I also install a newer version onto the USB drive since it's been some time?
  3. How do I know which partitions not to delete once I get to the custom Download?
  4. Anything else I should know? Or should do?
 
Solution
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Thank you This answered all of my questions and more I appreciate it!