Maybe, next time you feel the urge to drink, you consider the following options:

1. Find basic info about limits of function, and try to understand the basics. Find a list of known limits of functions, try to understand the basics, simplest limits, why it works that way. And then try to prove more complex limits by yourself. Look for info you think you are missing in the process.
2. The same, but about derivatives

Treat it like a game. List of limits, List of derivatives. Maybe, there is better links, idk