A great selection of incremental search (isearch) tips on /r/emacs:
miniblog.
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Inspired the helpful Using Emacs series: https://cestlaz.github.io/posts/using-emacs-6-swiper/ I've been experimenting with C-s bound to swiper rather than isearch.
I'm a big fan of Anzu: https://github.com/syohex/emacs-anzu for enhancing isearch, but I'm finding that I use swiper more with this new keybinding.
Nifty Emacs command of the day: avy-goto-char-timer: https://github.com/abo-abo/avy#avy-goto-char-timer . It combines avy-goto-char with an isearch style search.
(In my current keyfreq history, I have isearch-exit at 530 calls, but highlight-symbol-next at 1017 calls!)