Before you buy anything make sure you research it first. Start buying things that you own the infustructure for. Don't buy a 3d printer that doesn't support Linux, or buy a 3d printer that won't be effected by the 3d printing laws that try to stop gun parts from being printed.
That logic should apply to everything. If you are buying a IP camera make sure to get one that does PoE and doesn't connect and ping hone to a server before sending you your data. Don't buy a WiFi garage door opener unless you installed the ZigBee switch yourself. You should aim to be able to do everything yourself without needing subscription models or useless internet of things devices.
Things you likely want now before they get further ruined:
A google pixel phone to flash and de google.
A car before ~2013 that you plan on learning how yo repair when it breaks down.
A AMD based PC with a a 16gig GPU. Thats like the absolute lowest end you can use LLM's and defuision models locally that don't completely suck ass. And if you're not much of a gamer or desktop user you can turn this PC into a server and run your own services in docker so you reduce your dependency on apps.