A good overview of the main features/shortcuts available in pretty much every editor.
Multi line editing (& multiple cursors generally) is something that took me a while to really get used to but it's such a powerful feature.
Another thing I'd struggle without now would be some form of autocompletion.
It really pays in the long run to discover and find shortcuts for the feautures your editor has. I use Sublime and have got so used to its features and shortcuts it would take me a long time to be as productive in another editor.
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