I am not sure what exactly to google, on this issue. I have emacs 28.1 installed, with LSP-clangd and company-mode installed.
Suppose a function have signature int func(int i, int j), then emacs autocomplete it as
func(${1:int i}, ${2:int j}). What are these {$:int 1} things? How can i make sure these are not written to buffer on autocomplete? Or are they part of some workflow I dont know about? (Like in sublime text you can jump to such fields using tab).
yasnippet. It should be mentioned in the docs of whatever LSP client you are using.