Okay now that I got the bitchiness out of my system a bit, let's see if I can write a bit on """"rules"""" of witchcraft as I would like to see them.
Stop bitching about other people's practices and focus on your own. If you spent a lot of time worrying or raging about how other people practice, how will you ever grow your own? Focus on yourself and your own power and let other people do their thing.
Other people's practices are inspiration, not goals. On the flip side, if there is someone who you look up to, or someone's practice you love seeing, take it as inspiration for your own, but don't look it at as a goal to achieve. Firstly, what people share online is not the whole of their practice, and secondly you're not them and their path is not yours.
Be curious. Why are people harping on "black and white magic"? Why are Starseeds bad, but Alienkin and Starkin are fine? Why is cultural appropriation such a bad thing? (If you answered "because racism" on all three of these, have a cookie!) And not just curiosity about these concepts, but also about correspondences (Why are red roses a symbol for love?) or ingredients you have in your home (will this basil work as well as rosemary for this spell?) or other paths and techniques, or spirits, or -- you get the point. Once you know the "why" you can use your own discernment. Does this work for me? Do I agree with the why? Etc. etc.
Be respectful -. To other people, to other practices and cultures, to spirits and deities. Find out their customs and cultures if you can, and act accordingly. Did you know that not saying "thank you" to the Fair Folk is only a custom in Irish and Scottish folk tales? Yeah, exactly.
-But don't be terrified. You're a witch/wizard/warlock/unicorn/whatever dammit! Act like one! Witchcraft is about empowerment, so be fucking empowered! An anarchy saying is "no gods, no kings, no masters". As a polytheist witch who works with the Fair Folk for me it's more "lots of Gods, some Kings, no masters!" I meet them with respect, but on equal footing. I experiment because if I screw up, well, I'll have learned something, and I've learned a lot about getting myself out of weird stuff.
Have fun. For fuck's sake, your practice is supposed to bring you joy. If it doesn't bring you joy or make you feel fizzy with inspiration and energy, try something else. If you need to, toss the whole thing out and start over. Trust me, it helps.