In normal mode in Vim, one can use
y% to copy text between matching parenthesis.
y starts the yanking command and
% selects the matching closed or open parenthesis.
What is the Emacs equivalent of this operation?
mark-defun (usually C-M-h, but in c-mode it's mapped to
Jump between start and end of any region with C-x C-x to adjust boundaries of the selection.
Autocompleters like HELM show all functions that start with typed letters and their key bindings(if any).
C-M-u backward-up-list, moves point to an opening paren or inner block.
C-space starts region selection. Move with any known key bindings. C-x C-x for adjustments.