Find closing HTML tag in Sublime Text

Try Emmet plug-in command Go To Matching Pair:

http://docs.emmet.io/actions/go-to-pair/

Shortcut (Mac): Shift + Control + T

Shortcut (PC): Control + Alt + J

https://github.com/sergeche/emmet-sublime#available-actions

There is a shortcut (Ctrl+Shift+A for Windows and Linux users, Command+Shift+A for Mac users) to select the whole block within the currently selected tag.

For example, if you pressed this while your text cursor was within the outer div tag in the code below, all the divs with class selected would be selected.

<div class='current_tag_block'>
  <div class='selected'></div>
  <div class='selected'></div>
  <div class='selected'></div>
  <div class='selected'></div>
</div>

As @frazer-kirkman mentioned in a comments you can also move your cursor to the start or to the end of the selected block by pressing either Left or Right button on a keyboard depending on your cursor's position