Delta-chat Map (infos, visions, inspirations...)

My person just discovered “map” of which is actually an outstandig great tool, opens ways to GIS, delivery services, if using commercial… endless individual use, “independend”.

Pardon if already a topic and more infos avaliable, but haven’t found so far and thought to give it a topic for shares on it generaly.

What are the visions here?
What are the sourses of the map?
Shares of solutions in use?
How (and where) could one add datas (single manual, import)? (say having coordinates)
How could one export datas?..
Possibility to add/modify “tables”, formual, for data-sets (length of name, additional field…)