I should have more time after the weekend to give you a proper tutorial on parsing.
But for now, if you want to make an attempt on your own,,,,
Within my piadvanced script is a folder called pihole tweaks. There are a few different ways to parse lists within there. (Ideas borrowed from Reddit and here.)
What would also be beneficial for you to learn, is using git to push files up to a repository. You could then share the parsed lists with the community.
On a side note:
This repository is full of commonly whitelisted domains. (Sorted by service) You might save yourself a bit of headache in the long run by preemptively whitelisting things you never want to stop working. For me, that was Plex.
This is how much I'm currently blocking with my pi3: