Sites I find useful/interesting:
Maps and Cartography
https://adventuresinmapping.com
https://www.google.com/maps
http://www.philip-kearney.com
https://somethingaboutmaps.wordpress.com
http://www.statsmapsnpix.com
https://tjukanov.org
Forums
https://www.mkyong.com
https://stackoverflow.com
Tools
http://kepler.gl
https://www.lucidchart.com
https://repl.it