Stable Baselines3 skill: what it does and how to install it

What it does. Guides setup and use of Stable Baselines3 for training and evaluating single-agent reinforcement-learning agents. It covers algorithm selection, custom Gymnasium environments, vectorised environments, callbacks, checkpoints, normalisation, evaluation and video recording, with templates and reference guidance.

When to use it. Applies to reproducible reinforcement-learning experiments involving continuous control, discrete actions, custom environments, or SB3-Contrib recurrent and masked policies.