11. Don't Forget To Loot DURING Combat
EVERYTHING in RDR2 has a prescribed animation. Searching cabinets, healing - even looting an array of corpses after a fight.
Whilst it's an important part of the post-fight cleanup (providing you don't get caught), if you're low on equipment, don't forget you can still loot during a gunfight too. Keep in mind that your enemies are constantly taking cover and picking their shots, giving you enough time to make a mad scramble towards anyone who's been brought down so far.
Hold triangle/Y to do so, and you just might nab a valuable tonic or Dead Eye-restorer that'll win the day.