How to learn pynq framework and overlay concept

Hello all.
I am new to to python and pynq framework what is the good way to learn. All suggetions are welcome.

thank you in advance.

best regards
jagan mohan.

Others are welcome to add any resources they find useful. I would also be interested to hear about any difficulties you have learning about PYNQ. E.g. Which parts were hard for you? Where could we add more materials to help?

Thank you for your suggestions.