Knowing where and how to focus is one of the most crucial steps to getting crisp and sharp landscape photos. This helpful video will give you five tips and techniques on how to properly focus your landscape photos to get tack-sharp images.
Coming to you Mark Denney, this great video will show you how to achieve better focus and sharpness across the frame in your landscape photos. Denney talks about using focus peaking and how it can show you what's in focus fairly easily. While some photographers like focus peaking, I personally find I have a hard time making sure my subject is exactly in focus with it. I prefer to use focus zoom when manually focusing, as I can visually confirm right on the screen if the subject is fully in focus. This works with both mirrorless cameras and DSLRs in live view. It works especially well in a genre like landscape photography, where you're normally not under a lot of time pressure to get the shot. Do what works best for you, though, and check out the video above for lots of helpful tricks and tips.
And if you really want to dive into landscape photography, check out "Photographing the World 1: Landscape Photography and Post-Processing!"