The sections below provides some great resources to get get started with data visualization. However, don't forget that there is a very large and active community of data-viz content creators active online. There are thousands of tutorials on YouTube alone that provide brief introductions for almost every conceivable use-case, as well as longer videos and video series that provide mode general instruction.
Miami University Videos on creating visualizations in Excel and Google Sheets. The Miami University Libraries have many videos demonstrating how to create and share visualizations in PowerPoint and Google Slides, created by Miami Librarian Kristen Adams.