NO WORRIES!! I had an MBTI document before, but I kinda lost it... APOLOGIES 
However, there are a few sites that contain surface level information about Cognitive Functions such as Truity!
LINK : https://www.truity.com/blog/beginners-guide-understanding-mbti-cognitive-functions
If you have Reddit, someone made multiple posts covering each Function. Their user is u/Hellowally, just stalk their profile! Buuuuut if you wanna save yourself the trouble, the first post is:
https://www.reddit.com/r/mbti/s/9jfst3qYpq
They split it into two parts, but I'm pretty sure they linked the second part!
If you have any questions, I'd be happy to help! ^.^ Especially when it comes to typing yourself based off of those Functions. Typology has been a major hyperfixation of mine for years now AND SEEING PEOPLE GET INTO IT MAKES ME SOSOSO HAPPY 
HAVE A NICE DAY!!!
OOOO YIPPEE THANK YOU!! Ill start looking more into it, i find it really interesting 
HELLO!! i hope this does not sound rude, and please don't take it as such! i noticed you said "ISTP-T" in your rentry and i just wanted to let you know that -T and -A do not exist in MBTI and you are probably mistyped if so! especially if you used 16 personalities for it. i understand that not everyone is into typology, and this obviously isn't a serious issue. just wanted to let you know 
please learn cognitive functions instead! it's very easy. if interested, i'd be happy to provide resources! have a nice day!
Hiii thats okay! You're not being rude, thank you for letting me know
I don't actually own /rule anymore & whoever took it won't remove my content so i can't change that, sorry! I've been meaning to look more onto typology but I've been lazyy
I wouldn't mind having a look at your resources :3