I was tired of searching the issues of the arduino - esp32 core repo for problems and solutions and started to build up a Wiki for this repo.
I try to keep it up to date daily, whoever wants to contribute is welcome.
You can see a list of current entries here: Arduino core for ESP32 Wiki
I started as well to add some demo code for WiFi, Bluetooth, BLE, TCP and UDP communication on my website.
Maybe it is helpful for some one.