One of the things this guide is missing is to consider the kind of soil you’re using. I love Haworthia, a kind of succulent. However if you try to give them the succulent soil from a big box store, your first watering (even to a bone dry soil) will likely be fatal simply because the soil will retain too much water. Plants sensitive to too much water also need soil that retains very little water, sometimes even a medium with no soil at all (also called a gritty mix)!