Unlike the GNU sed manpage, the info docs are really quite thorough and contain many examples. They cover the vast majority of the features, and they call out

Unlike the GNU sed manpage, the info docs are really quite thorough and contain many examples. They cover the vast majority of the features, and they call out GNU specific extensions so they're useful for learning non-GNU sed too. They're available in HTML too¹, if you don't like the info user experience. ¹ https://www.gnu.org/software/sed/manual/html_node/index.html https://www.gnu.org/software/sed/manual/html_node/index.html