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Re:To Master Vim, Use It Like Language by 0942v8653 on Thursday October 01, 2015 @10:07PM (#10316216)
The commands you mentioned along with "ci'", "ci[", and "ciW" to replace all text between delimiters have been some of my favorite to use. It really annoys me when my terminal's vi-mode doesn't support "ci" (I think it's vim-only).
Re:To Master Vim, Use It Like Language by nitrogen on Friday October 02, 2015 @12:02AM (#10316676)
The "ci" and "ca" commands are part of a Vim-only feature called Text Objects (type :help objects in Vim's command mode, or search the web).

I like using yap and dap to copy/move paragraphs around when I'm editing markdown text.