Oh yes, loads of things!
I had a totally wet view on relationships and my expectations of men. That went right out the window!
Definitely became more feminist and more radical in my feminism thanks to MN.
Some parenting stuff. Used to be very hard-line on certain things, like belonging to this or that parenting camp. I'm a bit more go with the flow now and don't think it actually matters that much. Pick a parenting style that works for you.
It's changed my view on money. I used to think 20k was a lofty ambition I could never aim for, now I think that's still an amazing achievement but I have set my sights even higher and believe I can make it.
Used to be fairly antivax. Thanks to MN not censoring vaccine discussions on here I learned a lot and it's one of the sources that steered me away from the antivax stuff (this is a decade before covid).
Used to think all right wing people were just crazy or selfish. MN has opened my mind on that one.
Used to think car seats were overpriced and silly and you should get the cheapest you can find. I now find car seats fascinating examples of engineering (an aware this is very boring!) And spend my days trying to decipher the mess of all that plus regs etc for parents. (The motto, most expensive isn't necessarily best, but there is a point where they are too cheap).
Was anti abortion particularly for myself but probably a bit in general. MN taught me why that viewpoint is flawed and I'm 100% pro choice in every circumstance now.
Used to think ADHD was probably made up
or just something that affected little boys. After a while realised that descriptions of it sounded like me and now I'm diagnosed :o one of the best decisions of my life!