Ask HN: How to Leverage (Web) Developer Skill?

Previously i managed a team where most of them are "A players". Most of them knows the tech we use from bottom to up. Now i move to another region (and different team) where the skill of the team is under my expectation. We build a web app, but they're too slow to grasp the concept of the system we make. For example, they know what HTML is but they have no idea how HTML is transmitted over the network, so they don't know how cookies work at HTTP Header and how session work over encrypting cookies. As a matter of fact, we are iterating very slow. I just wanted to quit this team instead, but for now it is just unwise solution since i lead this new team (to increase their skill). Also, firing them isn't a solution for now.

What should i do to make them understand basic web development skill? Should i teach them basic browser and HTTP? At the same time, we have deadlines for the project.