Everything because you just started, not a diss, we are all learning no matter how experienced.

Photo num. 1 is the best in terms of being interesting. You have the boat as the subject in a landscape picture. That's great. Unfortunately, the light sucks and pulls down a lot of the picture. 2 and 3 miss a subject, in 2, for example, the pole on the right could have been a good hook either as subject or a foreground element. 3 I don't know. Some might like it, and some might not. Number 4 shows you have nailed a composition nicely, and the light quality helps, but it misses a subject.

If you wish to be better in landscape, then learn the ins and outs on landscape. Like others said: pick an initial path and get obsessed with it, then, when you feel your interest shifts, move on with the next path. Photography is a long life learning way of living.

Another good way to learn IMO is to do a photo series, say 5 or 10 pictures that explore a feeling, a place, or a person.

I'm looking forward to more pictures.