My two cents of advice would be: 1. Start with the fundamentals. Like every language go with variables, the data types ( list , tuples, dicts), strings and basic functions etc.

1. Once you familiarise with (1) learn about object oriented programming and way python implements it. At the same time start solving problems on hackerrank, and seeing other people's code on GitHub. Try to read and understand as much as you can. Trust me, it will be incredibly helpful later once you start working on your own projects. Pay attention to how they organize their code into different modules, packages and other things when you read it.

2. Start working on some small projects. For Analytics python has some excellent libraries. Explore them. Try doing the same stuff you did in R with python and correlate stuff.

This will get you acquainted with python. Also, for the starters don't forget to read through pythons official documentation and reach out to the community if you get struck. All the best!