Frankfurt is one of the main financial centers of the world (this is where the Euro comes from), and thusly, it’s airport is one of the busiest (fourth busiest in Europe). It’s the hub for Lufthansa and has arrivals from all over the world with planes landing something like every 2-4 minutes.
I have family in Germany, so on occasion, there’s reason to fly into this airport. It’s huge and can be quite overwhelming. There are 2 terminals, Terminal 1 and 2 connected by a sky train. Terminal 1 has about 105 gates, split into concourses A, B, C, and Z. Terminal 2 has 42 gates split into D & E. The airlines are split between the terminals/gates based on airline alliances rather than domestic/international so you could conceivably have to go from terminal to terminal.
There are railway stations below the airport, for both regional and long distance trains, which is helpful because Germany is a huge country.
Shopping is decent, but more geared towards business travelers. There’s a Burberry, Ferragamo, Versace, Mont Blanc, Porsche, and Hermes in terms of high end, but mostly it’s airport shops. Dining has a variety of German bakeries, many Italian takeaways and restaurants, Asian (lots, there’s crazy traffic from Asian countries here), McDonald’s, KFC, Burger King and Starbucks. I wish there was more traditional German offerings, but Ludwig’s fits that bill. Notably, there’s a Nordsee, which is one of my favorite Scandinavian fast food chains.
Remember: ✈️ = the wurst to ✈️✈️✈️✈️✈️ = the best
Convenience: ✈️✈️✈️ (the railways make it easy to get to from near and far)
Ease of navigating through terminals: ✈️ (this is a VERY large airport with multiple levels, although signage and directions are in both German/English, there’s not many of them, so make sure you have enough time for layovers as it can be very difficult to get from one end to another especially if you have to go between Terminals on the tram)
Convenience of check in/security lines: ✈️✈️ (for the scale of the airport, it’s as efficient as it could be, but there’s going to be a line)
Dining: ✈️✈️✈️ (not enough German food, but your basics of American and Italian fare)
Bathrooms: ✈️✈️✈️ (clean)
Charging stations/wifi: ✈️✈️✈️ (free wifi in certain areas)
Amenities: ✈️✈️✈️ (stores are okay, there is gate to gate transfer service available for a fee, showers for a fee, lots of executive lounges and even the ultra exclusive Lufthansa first class separate building)