QGIS 2.18 has been discontinued - the king is dead.
QGIS 3.4 is the new long term release - long live the king!
QGIS 3.10 is being developed - The princess is growing

In this talk, I'll try to highlight the very best features available in the QGIS 3.x series like:

• User profiles
• Multiple map views
• Native 3D viewer with support for vector features and mesh data
• Mesh data support
• Autocompleting search
• Unified Data Source Manager
• GeoPackage as the default format
• Select features by value tool
• Lots of new processing tools
• Project DB/Auxillary storage and easy custom labelling
• Editing in place
• New renderers
• Lots of improvements to Print composer
• Valid CRS Extents Preview