TIPS are side scenes in the game, that contain important information for figuring out wtf's going on in Hinamizawa. Some of them are pretty relevant to Rika, so I'm just tossing the relevant ones here. You can get them all here though.
( Crucial to understand Rika, involves spoilers )

These are the poems that start off every part of the game, and I'll be editing in my analysis on them slowly whenever I feel like it. They're good to give you something to think about. All poems taken from here. ( The poems themselves aren't spoilery, but my thoughts are. Perhaps more importantly, you won't understand them without knowledge of the series. Proceed with caution. )