Reddit mentions of Life Skills 101: A Practical Guide to Leaving Home and Living on Your Own

• You're allowed to throw used batteries directly in the garbage in fact that's the suggested way to dispose of them.
  
• Cooking Oil
  
  • Keep a jar under the sink to pour into.
    
• Learn every tool in your house. Go through his tool box (with permission) and google each thing, learn how to use it. Make yourself self-sufficient. Pretend every new thing you encounter is a Rubix cube, sure it's daunting and confusing at first, but 100% solvable if you just take the time to figure it out. Hell, learn how to caulk a window for fun.
  
• THE DOG OUTSIDE? That's not clumsy, that's ignorant and careless. That's unacceptable. That's LIVING, DEPENDANT CREATURE. You need to just reassess everything about your morals on this one. Also, this is the ONLY thing (aside maybe the shared cutting board) he can be rightfully upset about.
  
• Learn to sew, start small, youtubers have easy stuff, start with a bandana and keep building up, learn basic stitches. Lots of different ways to fold a towel so I'd suggest learning your boyfriend's preferred method since he seems miffed about how it's done. That being said, lots of youtube videos.
  
• Always wash your hands, like as many times as day as you can, before food, inbetween raw and fresh food
  
  • (I have a separate cutting board for meat only, it's plastic not wood so it won't store as much bacteria)
    
    Buy this book: https://www.amazon.ca/Life-Skills-101-Practical-Leaving/dp/0970133421
    
    This all really comes down to you making a bunch of excuses and not TRYING. Sounds like when you're single, you do just fine figuring things out, but when you're with someone else it's like your brain shuts off.
    
    And he seems really controlling and unreasonable. Like the batteries thing he's completely wrong about, what you were doing is fine, and seriously? Micromanaging how a towel is folded? Petty. He's not king of "THIS IS THE RIGHT WAY" He's not your mother, she was wrong too. He shouldn't be undermining you every corner. Very disrespectful.
    
    I agree with therapy to re-build your confidence and backbone. You probably have a really hard time telling the difference between what someone thinks is the "Right way" and what actually can be the "right way". Sounds like your mother V2.
    
    He also irritated me that ONLY ONCE he was a lower-tier dude, did he think you were good enough. That sounds like he settled for you, and that would worry me about his potential thoughts in the future.

Pretty sure there is some "Dummies guide to living on your own."

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Here you go, try a book like this: Life Skills 101: A Practical Guide to Leaving Home and Living on Your Own

Pretty sure there are dozens of others: Most stuff really doesn't take all that much "skill."

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Also, had you just paid a bit of attention to what your mother does -- while she is doing it -- you could have (possibly still can) learn a lot. That you haven't learned it to date, is really no one's fault but your own.