These are the manga I've read and liked/enjoyed/loved/laughed at/etc that started this decade and are still ongoing.

Nearly made it: Delicious in Dungeon, Wotakoi

10. My Neighbour Seki
9. Atom the Beginning
8. Cells at Work
7. The Ancient Magus Bride
6. Fushigi no Kuni no Bird (in French: "Isabella Bird")
5. Silver Spoon
4. Monthly Girls' Nozaki-kun
3. Golden Kamuy
2. Noragami
1. A Bride's Story