My favourite succulents resources:
[link here]
Llifle
Decent for giving care tips on specific succulents. You can find decent info about flowering/growing seasons and water requirements. It's not very well designed, though, and the search bar doesn't work. The way I use it is to type into Google: "PLANT :site:www.llifle.com".[link here]
Lithops.info
My favourite in-depth guide to lithops. It has a detailed description of the annual lithops growth cycle, including when it's safe and unsafe to water, what kind of soil mix to use, and an explanation of splitting. Plus it has a pretty good gallery of Cole-numbered lithops.[link here]