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PROBLEMS SOLUTIONS
rtc.h
webserver.h
not found
First make sure you selected the right boared !

Tools->Boared->ESP32Dev

then install (is the same problem shown after selected esp32 boared)

Tools->Manage Libraries -> seach and install
AutoConnect.h
NTPClinet.h
not found
Tools->Manage Libraries -> seach and install
Arduino 1.8.5 does not work after install Running ./install.sh will actually break the source code so running ./arduino won't work anymore.
Do not run install.sh.

Run the program arduino by using this command after 'cd'ing into the correct directory: ./arduino
How to install ESP32 Board in Arduino IDE ? 1. Open your Arduino IDE, go to File>Preferences

2. Put this Link into the “Additional Board Manager URLs” field as shown in the figure below. Then, click the “OK” button

Note: if you already have another boards (i.e ESP8266 boards URL), you can separate the URLs with a comma.

3. Then go to the Boards Manager. Go to Tools > Board > Boards Manager

4. Go to the search bar and type ESP32 then install ESP32 by Espressif Systems

5. Wait a few seconds then you've installed it
NO SPACE LEFT ON DEVICE ERROR (LINUX) - XVDA1 IS 100% FULL, WHAT IS IT? HOW TO FIX? Find Which File cause this size issue
$ df -h - (filesystem with sapce used and avilable)
$ sudo du -shx /* | sort -h (to find which file is large)
$ sudo du -shx /usr/* | sort -h
Delete Log files
sudo -i
echo "" > /var/log/kern.log
echo "" > /var/log/syslog
echo "" > /var/log/debug
service syslog restart
journalctl --vacuum-size=50M

For more info