vim search and replace using current line as reference point

Question

Is there a way to specify search and replace range using the current line as a reference? I can specify range using explicit line numbers like

:5,15s/foo/bar/g
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Answer 1

:help :range gives you all the details; you can do quite sophisticated things, e.g. :'a;/pat1/-1.

For ranges starting from the current line, a neat trick is to start command-line mode by prefixing the : with a count: E.g. 5: turns into :.,.+4.

Protip: Learn how to look up commands and navigate the built-in :help; it is comprehensive and offers many tips. You won't learn Vim as fast as other editors, but if you commit to continuous learning, it'll prove a very powerful and efficient editor.