1) Wheels on/under everything I can't lift and carry and or load into the trunk of my car. This means workbenches and cabinets, maybe one of each not so. Bandsaw, air comps, press, welders, SSQA tool pallets ... More shelf units are anchored than free standing, but I like the ones with wheels.
2) Ear plugs in pocket. btw, 24/7/365 since the '70s, 30 yrs in auto plants, 20 yrs tractoring. I'm 70 in May but even voices can be painfully loud. That said, I can hear a 'coon fart 20 paces downwind of me.
3) Round, square, triangle, flat and thread (Imp/Metric) files.
4) Corded versions of ALL power tools, esp grinders, DAs/orbitals, saws. (Power to weight) I just bought my 3rd cordless drill in 40 yrs, a 12v Ryobi to replace prior 12v Milwaukee & 12v DeWalt. With a drill press on wheels and two mills I don't hand drill much over 1/4" anyway.
5) Something to dissolve rust because WD-40 just doesn't, kiddies. (It's mineral spirits and mineral oil. Read the MSDSs, it's more like MMO than different.)
6) Dial or digital caliper. ($20) Digital also doubles as us/metric converter, set a number and change mode.
7) Fluid Film, Formula 303, Boeshield to be applied as protection if you're not like me and let s__ weather while the cans keep dust off the shelf.