As a title, I need advices which skills are necessary and additional to become GIS specialist/developer.I know QGIS, ArcGIS, Grass, SAGA a little. I know basic SQL, basic python, basic JavaScript/HTML. What else is needed? I would like to learn better PyQGIS - could somebody give some good materials/tutorials to learn?I would like learn some JavaScript library. I wonder about Google Maps API, Mapbox, OpenLayer3, Leaflet. From which is better to learn firstly?I think also about learn XML, UML, GeoJSON and some spatial RDBMS? It is necessary or good additional skills to have?
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