Having the correct cookware

Like, I got a nice cookware set - had some pots and pans, and I got some trays. But like, didn't have a cake tin, or muffin pan, flat tray (necessary for cooking hash browns), square tin for brownies, etc. I was so used to just being able to go into the cupboard at home and grab anything that I forgot I wouldn't have everything when I moved out haha.
Also didn't think about just how expensive living is. Like, I had a general idea - went shopping with mum and dad, feel like they were always open about stuff with me, but I definitely didn't realise how it all adds up. In particular, electric toothbrush heads, and razor heads - like, necessary stuff, but I have a mental battle with myself every time I need to buy them, just because I wonder whether I can actually excuse spending the money lol.
Also completely forgot about lint brushes. And scourers. Changing lightbulbs (and knowing which type of replacement you need). So don't forget about those haha. Oh and BATTERIES. Seriously. Kinda forgot that a lot of stuff needs batteries to run.
Last point I can think of at the moment is I think it's wise to know how to get stains out of various things, because like, there's a different method and different things to use for most stuff, and you need to be able to work on stains quickly, and sure, you can google, but what if you don't have the necessary stuff at hand? You've got to go out and buy it and it's just not convenient.