There is a veritable plethora of ways to edit any image, and each method has its own benefits and drawbacks. This interesting videos discusses why one photographer chose to stop editing using sliders, instead relying solely on local adjustments.
Coming to you from Thomas Heaton, this fascinating video follows him as he discusses why he edits his images solely with local adjustments now. While this may take a bit longer, I find it to be quite the intriguing method. The most obvious benefit is that you build the image up from scratch. Whereas with global adjustments, you'll eventually have to tweak local areas, starting with local adjustments allows you to bypass this. I personally think this makes the process of editing more immersive, simply because you're focused on each individual detail throughout the process. On the same token, it's important to take time to zoom out and examine the image as a whole. I personally find that it's easier to go overboard with local adjustments, which might not be clear until one zooms out and sees them in context. Check out the video above for Heaton's full thoughts.
And if you really want to dive into landscape photography, check out "Photographing The World 1: Landscape Photography and Post-Processing with Elia Locardi."