This is a huge time saver. Once you learn how to set one, you will most likely find a gazillion ways to use macros. If you are wondering what a macro is? It’s just a recording of keys you press and then you store those keys in memory. You can than trigger that memory to loop through and do repetitive tasks for you. Bottom line: Your productivity will skyrocket when you learn macros.
Here’s a video on how to do this in ST2: