I've been playing MGS and enjoying it a lot. It's an obtuse systems heavy game with unforgiving mechanics. Figuring my way through it I picked up on a few very important tricks:
-Cap your hunger and thirst at a 100% as much as possible. When at a 100%, those meters will stick there for a few minutes instead of constantly depleting. This way you don't have to worry too much about hunger and thirst and save up on ressources.
-Get the dodge skill. It's a game changer.
-The leg sweep can be used to stun animals and capture them. This only becomes useful when you unlock animal pens.
-Molotov Cocktails are very good in early single player
-Items and animals respawn after a set amount of time (maybe real time)
-Do interesting optional missions(survivors)before main missions. As shown on the quicklook side missions might expire when you progress the main mission.
-You can shoot down birds for food and rare crafting materials
What are your personal tips and tricks? With its systems heavy nature and difficulty I know people are bound to find cool strategies to get through the game. Metal Gear Survive kind of feels like the Demon's Souls of 2018 in that regard.