Any large garage style doors obviously need to open outward, secured from the inside medieval style (assuming you have a separate personnel door) - make sure you coach bolt through the hinges.
If possible personnel doors should open inwards. Reinforced frame, hinge bolts, quality mortice locks. Please don't rely on any locking system based on a euro lock. You can get multipoint that runs off a normal key (from ERA I think). Add any extras that you can eg steel plates over lock areas, quality heavy duty handles etc etc.
If you have to rely on any exposed padlocks try to house them in steel lock boxes (only open at the bottom) and use something good (Cisa).
I sometimes have to break into our steel security doors when idiots loose all the keys or to get in after a botched break in attempt has ****** up the door locks. If they were inward opening I wouldn't be able to force them, luckly they are outward opening and I know what to do
Outward opening means you can get between the door and frame with bars no problems (bend the jemmy strip out the way if its got one), straight at the locks/hinges.
I do often wonder if people offering door security advice have ever broken into a door before, obviously the lock smiths have - but who else? Lot of armchair experts.
FWIW