In addition to what others have said: Eye protection, earplugs, Those free moving blankets from harbor freight I lay them on the ground/floor when I'm working so I don't get completely filthy and keep one in each car. Harbor freight long wrench set, a drill, good drill bits, an angle grinder, a cutoff wheel, a Dremel or similar, a 1/4" electric ratchet, pry bars, pick set, a gasket scraper, empty spray bottles from Dollar tree one with soapy wooder and one with some kind of degreaser, the big jug of orange hand cleaner, a nail brush for scrubbing your hands, work gloves the thinner fabric kind with coating on the palms/fingers they have them in Amazon but I get them from work, funnels, an oil catch pan that stores the oil inside, an open catch pan, a magnetic parts tray, long extensions, trim and plastic fastener tools, 3 lb sledgehammer, pipe wrench, torx bits from T10 thru T55, wire and nylon brushes, look for manufacturer specific app for your car forscan for Ford, jscan for jeep/Chrysler/Dodge there's a ton more out there, they let you do a lot More than just the check engine light you'll need an obdii adapter that works with that app, you might want a generic elm327 as well and download the torque app. Watch the torque test channel and project farm on YouTube. Be aware of the rental tool program at most parts stores as well, then there's a bunch of specific tools you might want or need that I won't get into.