Purdue's OWL (Online Writing Lab) is the "go to" for instruction on how to use APA 7th. Below are a few of the topics OWL has. Check out their website for more. https://owl.purdue.edu/index.html
If you need to format your research paper or dissertation in APA style, check out these tutorials from APA.
There is no electronic version of APA 7th edition.
"APA does NOT have an institutional license model for APA’s Publication Manual, but electronic versions are available at Vital Source (www.vitalsource.com) and RedShelf (www.redshelf.com).
To help students in need of APA Style guidance, tutorials and quick guides adapted from Academic Writer®, APA’s tool for teaching and learning effective writing, are now freely available through July 1, 2020.
The Basics of Seventh Edition APA Style tutorial and other material will stay on the APAStyle.org site for free after that date. "