You call the scry
lands your "favorite
lands that always come in untapped."
Aside from that, I didn't notice any mistakes. I would argue that by only including cycles you're missing out on some true staples like
Command Tower and other any-color
lands.
Even if you ignore all of the utility
lands that get played for reasons other than mana production, there are still quite a few that everyone should know. Given that this is meant as a primer on
lands for EDH, it seems like fairly ubiquitous
lands deserve a mention.
You might also want to include a section describing your philosophy on building mana bases. Many people assume taplands are the best choice in their budget range, even though basics and a proper ramp package would oftentimes be a more consistent but still budget-friendly option.
Good work on the cycles, though. I'm sure this will help people build affordable but useful mana bases.