doc: add "Use pytest's strict mode" to good practices

Author: bluetech

changelog/13823.feature.rst

@@ -8,3 +8,5 @@ The individual strictness options can be explicitly set to override the global :
 If new strictness options are added in the future, they will also be automatically enabled by :confval:`strict`.
 Therefore, we only recommend setting ``strict=True`` if you're using a locked version of pytest,
 or if you want to proactively adopt new strictness options as they are added.
+
+See :ref:`strict mode` for more details.

doc/en/explanation/goodpractices.rst

@@ -329,3 +329,73 @@ A list of the lints detected by flake8-pytest-style can be found on its `PyPI pa
 .. note::
 
     flake8-pytest-style is not an official pytest project. Some of the rules enforce certain style choices, such as using `@pytest.fixture()` over `@pytest.fixture`, but you can configure the plugin to fit your preferred style.
+
+.. _`strict mode`:
+
+Using pytest's strict mode
+--------------------------
+
+Pytest contains a set of configuration options that make it more strict.
+The options are off by default for compatibility or other reasons,
+but you should enable them if you can.
+
+You can enable all of the strictness options at once by setting the :confval:`strict` configuration option:
+
+.. tab:: toml
+
+    .. code-block:: toml
+
+        [pytest]
+        strict = true
+
+.. tab:: ini
+
+    .. code-block:: ini
+
+        [pytest]
+        strict = true
+
+See the :confval:`strict` for the options it enables and their effect.
+
+If pytest adds new strictness options in the future, they will also be enabled by ``strict``.
+Therefore, you should only use ``strict`` if you use a locked version of pytest,
+or are prepared to fix occasional problems as new pytest versions are released.
+If you don't want to automatically pick up new options, you can enable options individually::
+
+.. tab:: toml
+
+    .. code-block:: toml
+
+        [pytest]
+        strict_config = true
+        strict_markers = true
+        strict_parametrization_ids = true
+        strict_xfail = true
+
+.. tab:: ini
+
+    .. code-block:: ini
+
+        [pytest]
+        strict_config = true
+        strict_markers = true
+        strict_parametrization_ids = true
+        strict_xfail = true
+
+If you want to use strict mode but having trouble with a specific option, you can turn it off individually::
+
+.. tab:: toml
+
+    .. code-block:: toml
+
+        [pytest]
+        strict = true
+        strict_parametrization_ids = false
+
+.. tab:: ini
+
+    .. code-block:: ini
+
+        [pytest]
+        strict = true
+        strict_parametrization_ids = false