buffervswindowvsframemodelineecho areaminibufferfont lockingcorrect term for syntax highlighting. made up offacesof properties (color, font, text size …) that pretty-print the textpointanother word for caret or cursor: visual marker where characters typed will appearmarkregioncontiguous block of text bounded bypointandmark. in other editors called “selection” or “highlight”current bufferbuffer thathas the pointextented commandfunctionality behindM-x
C-u C-M-xwill calleval-defunwith a prefix argument, which instruments the code for debugging: https://stackoverflow.com/a/22220509/1842221