Much of Bazel's strength comes from the ability to define new rules which can be used by others. There is a growing and evolving set of rules to support popular languages and packages.
Contact the respective rule set's maintainers regarding issues and feature requests. To find more Bazel rules, use a search engine or look on GitHub.
Here is a selection of recommended rules:
The repository Skylib contains additional functions that can be useful when writing new rules and new macros.
Native rules are shipped with the Bazel binary, they are always available in BUILD files without a load statement.
Bazel also embeds additional rules written in Starlark. Those can be loaded from the @bazel_tools built-in external repository.