We (Zero-K devs) have been discussing ways to teach new players and videos are quite effective and cheap to produce (compared to a full tutorial's worth of coding). It's great that you have decided to make some videos and we'll support you if you need any help because teaching players has become a high priority.
I know a few extra things about some of those topics and as you're remaking the videos I'll give you some extra things you could include.
Custom Formations
The precision movement feature of custom formations wasn't included.
Right click and drag with a single unit selected and it will follow the line your cursor follows. It's useful for cloaked infiltration, keeping spiders walking on cliff faces and sneaking through gaps in base defences with scouts. If you have a group of units selected hold Alt and right click to make many units follow a line.
There is a bit of awkwardness in the line follow controls in that to append a line to follow after the first one you have to hold 2 keys; Alt and Shift.
This command also works for Fight. It technically works for Patrol and Jump (it gives the commands correctly) but is extremely useless. Also useless for aircraft.
While covering movement you could cover some things built into spring, and anyway, from the point of view of the end user custom formations is built in.
If you hold Alt and right click the units will form a rectangle formation on arrival. If you hold Ctrl the units will keep their current relative formation and most importantly move at the speed of the slowest member of the group. Ctrl works for patrol and fight but Alt only works for move.
If you hold Shift for normal Ctrl or Alt move instead of basing the command off unit position the command is based off the position of their last waypoint.
Ctrl and Alt can be held down to use the rather useless custom formations line move while keeping relative positions. I only use this if someone is hiding a cloaked unit at the end of the game. Get a lot of cheap units and tell them to line move to the top of the map, then hold Ctrl+Shift+Alt and drag down the middle of the map to make them sweep the entire map without bunching up.
Just a note for attack line command. Wolverine is awesome when used this way as you can place large evenly spread minefields.
Building Placement
I only know a bit more about this subject. Basically you can use Ctrl while building as well. Hold Shift+Ctrl and you'll get a line of buildings that snap to a cardinal direction. Hold Shift+Ctrl+Alt and you'll get a hollow rectangle. Of course both these commands obey spacing.
Also in groupings part you could mention ctrl-x (selects all ungrouped units of the type you have selected).
This may be a bit confusing as your selectkeys depend on how you install spring so will not be the same default for all players.
How general are you planning on making the videos? Some Zero-K specific stuff (eg terraform) would be really appreciated.
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