Pandas Datareader accesses data through all these data sources. Check it out.

The Python Backtesting & Automation course is available as self-paced option. You can purchase access to the course's materials and start doing at your pace with a support group on discord. More details here: alternativehypothesis.github…

This is a game changer. Almost all the good financial data in the web organised neatly in one place, in one app. The sources of data are all decently credible for free data. With the Python API to leverage these features, it's a brilliant add-on to your research arsenal.