how to copy a range of lines

let's say youve got an epub of some book
you use calibre to convert it to .txt
so you can practise typing a chapter of it.
you can skim through the toc

• use / to search for chapter headings
• or you can visual selct a a word with viw
  then use * and # to nav to next and prev instance

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to copy a range to system clipboard:
:1,10y +
this copies line 1 to line 10 to the "+y system clipboard

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• you could also use :grep or :vimgrep but im not going to get into it this time
• gf = go to file
• gd = go to definition
• ctrl [ on visual selection is the same as gd?