The readelf man page is really the best place for information. Thankfully, we have access to that man page in more than one spot. If you prefer the online man page, you can find it at the following URL: https://sourceware.org/binutils/docs-2.32/binutils/readelf.html#readelf.

Otherwise, use step 2 of this recipe and keep it open in a separate Terminal tab if need be. Either way, reference the man page as often as you need until the arguments for readelf become second nature when you're using the tool.