Stardew Valley is an indie farming simulation role-playing video game developed by ConcernedApe and published by Chucklefish Games.
Starting with the strategy of the game, the main purpose of the game is the farm, mine and npc progression to get the ending. So I would say that the main “Strat” would be to farm as much as possible to get money as quick as possible. But there are so many ways to play this game thats why I like it so much. You could go the mining rout and try to get the best gear and/or go fishing. They are so many ways to play this game so you could rack up so many hours trying the different ways to play the game.
You get literally no information when starting the game apart from the fact you you inherited the farm and its to get you away from city life, to be fair you know the premise before starting he game, but you learn very quickly. You progress by going to the mine and upgrading your gear, selling your goods to get money to use upgrading your farm, increasing the amount of hearts the npcs have with you (how much the like you) then maybe getting married.
You gain more health the more star bits you find but the are incredibly rare and you only get them through progression and getting other rare items to use the get them, this way it stops you for becoming heavily over powered and not a god. This also increases the amount of mana you have because you can only do enough work per day you eventually get tired, because of farming and mining ect, this increases this bar so you can mine longer and fight mobs on lower floors of the mines to get rarer items.
Getting money from what you sell. For example getting better gear being to make money quicker. Thats basically it.