@joshuapsteele Emmet is great for both, but/and actually the biggest things in my experience are to:

• learn the languages themselves well (which makes the keyboard stuff easier to use as well!)
• be attentive to the diminishing returns with the keyboard shortcuts

I went through a phase where I tried to build every bit of HTML of and CSS with expansion and that was good for learning it but now I use it when it's faster and just type it out when it's more work to get the abbreviation right.