SentenceCoach
Fixes a learner's Mandarin with the smallest change and says why
Emerged finds new products worth a look, daily — what’s new today
Ten minutes a day here builds Vim muscle memory without risking a real file, and it accepts any edit that reaches the target text.
hjkl teaches Vim by making you do it. Pick a skill such as motions, text objects, search, marks or counts, then work through six edits: two guided, two prompted, two on your own. Any sequence that produces the target text passes, and :help lists the commands in play. It is free, needs no account and stores nothing. Made by Duy Hua. HN readers found spots where the simulator differs from real Vim, and the maker is adding the fixes they asked for.
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