This is the official manual for the latest Org-mode release.
With just a few keystrokes, Org's easy templates inserts empty pairs of
structural elements, such as
templates use an expansion mechanism, which is native to Org, in a process
similar to yasnippet and other Emacs template expansion packages.
<<> <s> <TAB> completes the ‘src’ code block.
< l <TAB>
Org comes with these pre-defined easy templates:
More templates can added by customizing the variable
org-structure-template-alist, whose docstring has additional details.