Starcraft things to remember:

Reapers are probably the most IMBA scout ever, not including scans, which are costly in a race-advantage way.

Scouting kills the need for "knowing timings" such as when a certain unit will come out, whether it has cloak or not, or is just annoying.

Proxy 2 gate is actually powerful. pull 4-5 scvs off to repair.

Tap your hotkeys often just to check their progress. More tapping = better Macro.

Do I need a new hotkey setup?

Current setup:
123 units
4567 Production structures
890 ?? temporary things...? like EBay, tech labs? need to use more

don't be afraid to attack early. if you both play a perfect macro game, you have the same number of units. if you rushed, let him have it.

1 soldier to each base to check and "scan" is so powerful.

pulling people is easy: attack anything new or something they need. drops are ok, maybe they have their place but pulling people with ONE soldier (because they one group control syndrome, they'll pull the whole army to deal with your one soldier. then you a-move your army right into their main.)

xel'naga watch towers = imba and worth fighting for.

builds i know:

fastest bunker rush (6 depot, 6 rax)
6 rax clinton cheese
no gas marine FE
1 rax FE
2 rax FE
3 rax push
MMM
1-1-1 fast thor
1-1-1 banshee hellion marine
1-1-2 2 port banshee with cloak
2 rax 1 fact MM+siege tank

that's all for now!