":" - Any time a step ends in a ":" instead of a "." means that the next step is part of the current step you are on. This generally means the next step should be done while working on the current step. This means every "start working on" or "continue working on" will end in a ":". But this is used with other occasions as well, so keep this in mind.
I defintely think at 118 you should go and do all four of these parts. These are required to unlock World Quests and probably take about 60-90 minutes to get through. If you do these whilst levelling (especially all in one go at 118) then when you hit max level you're ready to go on WQs. You can go finish the zones quests at your leisure over the next weeks/months or never even finish them if you don't care about questing.
Garona - Alliance Garona - Horde Genjuros - Alliance Genjuros - Horde Ghostlands - Alliance Ghostlands - Horde Gilneas - Alliance Gilneas - Horde Gorgonnash - Alliance Gorgonnash - Horde Grim Batol - Alliance Grim Batol - Horde Gul'dan - Alliance Gul'dan - Horde Garrosh - Alliance Garrosh - Horde Galakrond - Alliance Galakrond - Horde Goldrinn - Alliance Goldrinn - Horde Gordunni - Alliance Gordunni - Horde Greymane - Alliance Greymane - Horde Grom - Alliance Grom - Horde
Edit 20 It’s been a week since this post and a lot of people are still reaching out to me with questions which is fine. I have had a few different people reach out to me to help make YouTube videos based off this guide and more info in BFA which I’m more than willing to do. Whoever gets the videos up first I will link them here for you guys to enjoy.