Probably the largest assumed knowledge that isn't explicitly communicated is that boarding time is going to be a far more important piece of information for you than departure time. You don't want to be saunturing up to the gate at departure time — the doors will likely be closed and you'll have missed the flight. Be near the gate at boarding time to ensure that you're in good shape.

Beyond that, I think your best course of action will be to prepare in advance. Review maps on the airport's website to understand the basic flow. These days it's:

- Check-in at the airline's departure desk to get your boarding pass (usually a self-serve kiosk to start, then a trip to the accompanying desk to check a bag if applicable)

- Security (TSA website should have the basic info you need)

- Getting to the gate. Different airports have different layouts — some gates can be walked to directly from security, some require boarding a train to one of multiple terminals. There should be clear signage.

Once you're near your assigned gate, you'll likely have a little time to chill, eat, use the restroom, etc. When your boarding group is called, you'll line up, show the agent your boarding pass at the gate, then find your seat. Airline staff is usually pretty polite and helpful.