Check out Greg Forney's YouTube Channel and follow the handout.
This first video is a comprehensive approach. The numbered exercises in the handout should be practiced multiple times before going on to the next exercise.
Handout #1 - https://drive.google.com/file/d/1dpnRA8LYycIaOo02_KRi92X4bDWE3c4n/view
Handout #2 - https://drive.google.com/file/d/12twpnlCV8tIcMO6fhyBnF5wALPqsOwz5/view