Quality tools in general. Be disciplined in storing them well and in one place.
A good chef’s knife and gear to keep it sharp. You will never want to go back.
Cast iron pan has been said. A good multi layered stainless steel pan (so layers all the way, not disc bottom). Indestructible and doesnt give you cancer like teflon.
A leatherman or similar multitool.
Good binoculars, if you’re into that kind of stuff.