Always suck up every last resource in a region before warping to the next mission.
You can totally warp a cap ship inside another cap ship for big explosions.
in HW2 it will auto collect, but yeah in HW1 waste that hour and harvester after the end of a mission.
Do max out your captial ships limit cap.. that way you can steal enemy ships and go over the cap. in the last mission in HW1 I had like 4x the cap of destroyers and 2-3x cap of battleships.
very perdy game (here it is in 4k)