Smartparens is another of those projects where the dedication and quality of the work by the maintainer regularly impresses me.
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I've added GIFs to the smartparens README! https://github.com/Fuco1/smartparens#smartparens It can really help new users grok the feature set.
Emacs tip of the day: try smartparens-strict-mode. It makes C-k keep brackets balanced! `foo(1, |bar(2))` press C-k and `foo(1, |)`. Nice!
Emacs command of the day: sp-rewrap-pair (part of the must-have smartparens package). It lets you go from foo(bar) to foo[bar] effortlessly.