Don't be caught up in what or how others are doing. Think what it is you like about a particular look, and look at Photoshop to see how you can go about creating the look. Does it look high contrast? Does it look warm or cool? Are there funky colour cast you like? Grainy or clean? Rather than learn how to do 1 look individually, if you think about what makes it look good, you will learn a lot quicker, TBH.
For 90% of my photo processing, I just use Lightroom's basic features. If I need to retouch, I will use curves and hue/saturation adj layers with layer masks. And a touch of clone stamp. Maybe sharpen a touch. There are a few more things I do, but that's mostly it. Some retouch can take me a good few hours to nail. But that's all in the small details, you see. To get the global look, or style, can be achieved in 5 minutes if you know what you want.
"How" to do isn't really important, as Photoshop is such a versatile program, and you can reach the same results using virtually hundreds of methods. Play with it, and discover your own style.
But if you haven't got the time to learn properly, there's always Youtube which is a big well of resources
