From watching Video 1, I have some pointers.
1) OMG, F6, Have a focus on the Tech Tree, aim for a particular attribute, ie, Archery for Archers=Defense.
2) Use the Tiles attributes for the best production, Floodplains = 4

with a Farm + 1

unused

3) Its all about the production, Forest grassland = Woodcutters 2

+ 2

4) Forested Hills, can have woodcutters, before you get Mining.
5) Clear Forests that touch your city square, BUT, if the touch across a river keep them as bait for attackers. Forest = 0.5 Health/square.
6) ALWAYS escort a settler. A city with no defense = lost city.
7) Rivers in your culture = road for trade purposes, only outside of culture do you need sailing to use them. Must be uninterrupted by other culture to act as a road.
8) MORE WORKERS, you always need more workers.
Personal play style - (I have to say)
Single unit graphics, Cntl-O, will utilize the Mods graphics for units better. Its the mod you need to customise it in. Upon launch, using the desktop icon, Options and select "Enable formations"
Screens are customisable, you can get more info if set up differently.
: SVN version 1067 games aren't compatible with SVN 1068, DON'T UPGRADE VERSION. unless fix is made.
Great effort on making a video, thanks.