I have a 22x30 detached I use for work, its got 50 amps of power, a heatpump/ac mini split,50k btu propane unit heater and 5kw construction heater for backup. The heat/ac really depends where you are, around here we see -40 to +40 temps between summer and winter.
For tools I've got an Autel bi directional scanner. B5/6/7 Bentley and Haynes manuals. I have a computer out here for looking stuff up while working connected to my house via cat5 and a full toolbox of various sockets/bits/power tools, I think snap on semi deep sockets are my go to, everything is is Craftsman or Mastercraft and a bunch of Milwaukee M12 ratchets/impacts/impact drivers, good 3 ton low profile floor jack and jackstands. Most importantly is a beer fridge.
I've got 10ft ceilings so a portable lift is next on my list.
Also keeping parts on hand is huge, I keep a whole front end control arm kit, wheel bearing, brake pads, oil/air/cabin/fuel filters on hand, spare set of rebuilt rear calipers, couple wheel speed sensors and whatnot.

Last pic of the garage is literally as I was about to install the last piece of fascia after the garage not being updated outside since it was built in the early 80s
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