This is my index for some of my favorite mods for the game :) Its super easy to mod stardew, and can give you a lot more stuff to do in stardew. Here I have only the most basic mods, since I have not modded my game that much. Stardew expanded for exemple is a whole second town, with their own npcs and datable characters. Its insane how much the community has contributed to mods. The links at the top go directly to sites like curse forge, that people post their mods in.
For a guide on how to mod, the wiki has this very complete guide right here Stardew is very mucha wiki game. what I mean by that is that the game has so much content hidden, or that isnt explainded how to get them that the wiki is a very used tool for every stardew player. Ive included a link at the top of the page for quick access :)

maybe thats just me, but i love preparing in advance how my farm will look like! I use this tool a lot at the start of my farm to have an idea of where to place the buildings. For the detail, I usually go on pinterest to look up other people's farms for inspiration. Krobus, the best character of stardew (jk all characters are nice). The character im currently romancing? friendshipping? He is very cute, but im not going to get perfection on his file since Major Lewis is the one to accompany you and... no way im going to have the major be there. Sorry Krobus ;-;