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Kelly Galloup has some great videos on streamer tying. He’s posted a bunch recently as well, including ones on setting materials, wrapping hackle, and constructing deer hair/wool heads. His tutorials deal with material selection & preparation, articulation, tying techniques, etc. They are great, and well worth a watch. My streamer box is probably 60% galloup flies, or versions of his patterns I have tweaked.

Personally, I tie what I use/have need for in my fishing. My principal enjoyment in fly tying comes from innovation, tweaking "standard" patterns with different materials, color combos, etc. All of my most effective patterns have come from this. The basic skills/techniques involved are fairly universal, regardless of what you are tying. So unless you have ambitions to become a commercial tier and feel a need to be able to pound out any and all sorts of flies, I don't think you would be "hindering progression" if you only tied streamers or dries, to the exclusion of nymphs. I'd say tie what you enjoy tying, and can/will need and use in your fishing.