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.
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.