Been using it (not often beyond basics for home server container administration) for years but I always get confused with searching vs search and replace vs global search

/ (n for next instances)

:%s//

:g//p (grep was named after this one IIRC, Global Regular Expression Print)

And often I just use :%s to search and highlight all instances and don't press enter because I forget the others and I often have to search and replace for docker comppse snippets.