Nothing beats learning by playing, so do lots of it whether face-to-face or online. I also highly recommend
notating your games. Most online games do this automatically, but if you play f2f use a pencil and notebook. It can be very helpful to revisit a game on your own later because you can go through it step by step analyzing your own game - what worked, what didn't, etc. And, of course, you can do this with your opponent's moves as well, understanding why they made the moves they did.
I also like to sit down with notations of famous games played by grandmasters and play it out to study it.
I don't play near as often as I used to unfortunately, but my rating was right around 1700 when I was.
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