A common strategy for starting games is to randomly click until you get a big opening with lots of numbers. If you flag all of the mines touching a number, chording on the number opens the remaining squares. Chording is when you press both mouse buttons at the same time. This can save you a lot of work!
Slot games work by using a set number of symbols that can appear on a fixed layout. The symbols in every position are random and can form strings of matching icons on the same line, which awards a payout. Online slots also have extra features to help generate wins, like wild symbols, scatters, and bonus spins.