There are a lot of great Matplotlib reference pages and examples online, but laying hands on one inthe moment you need it can be challenging. Here's a list of things I've found helpful.

Resources

Matplotlib API documentation

• Axes
• Line2D
• Figure
• Markers
• Text
• Annotation
• tick_params()
• ticker
• title

Galleries

• Text
• Annotation and Bounding Boxes
• tick Formatters
• tick Locators
• grid()
• title

Tutorials

• Ben Root's Anantomy of Matplotlib
• title