If you are actually interested in learning, it’s not too hard, you’ll be slow for a little bit but it pays off in the end.
First, understanding there are actions and objects and quantifiers. Actions are what you do to objects, so when you want to (d) delete, that is the action, then you’d want to specify a object. ($) being the end of the line, (^) start, (w) is word, (j), (g) is top of file and so on, these are already the words you’ll use to move along as well.
Then, for many of these we can add quantifiers, i.e. repeat x number of times.
So 3dw is delete three words and 3dj is three lines down and so on. If you want to select, it’s just swap v for d and off to the races.
Once you learn the basic concept, you really only need a few actions and a few objects to be functional.
Print/find/make a cheat sheet and put it up by your monitor or keyboard and give yourself a week.
Also, checkout the vimtudor or vim golf and play the game for a few minutes.
one thing to note that scihub (and maybe other options) doesn’t preserve supplementary info. usually it’s freely available, but elsevier for example likes to constrain access to it
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