I have been playing a lot of Harvest Moon: Friends of Mineral and memorizing what each character likes can be a bit daunting at times so I use it a lot. It also helps when you are trying to figure out certain character's schedule and where specific items are found.

Lots of pages also go the extra mile and include a trivia section and a list of bugs.

It makes me wonder which other fan-made wiki's are of impressive quality or even just which other wiki's people have used.

I imagine Stardew Valley and Pokemon have some really good ones.