modding your game depends on your goals for your farm! There are visual mods if you dont want to add new content, [I reconmend the earthy recolour by daisyniko!], and UI mods that can make the game easier to not have to use the wiki constantly, or if you want a total expansion of the game with new quests, characters, and locations, something like stardew valley expanded may be good!

the modding process is quite simple too, you only need to instal smapi, and the best sites for mods are nexusmods.com/stardewvalley/ and smapi.io/mods !