Flying alone for first time, what do I do?

I'm pretty anxious to be honest. I'm scared I'll get lost in the airport or something and miss my flight…

I'll be flying from Oslo to Edinburgh.

If anyone has any tips about flying alone in general or these airports in particular, those would be very appreciated! I'd really like all kinds of advice/tips!

Are there any disruptive model in the airline industry like electric planes or hypersonic in the next decade?

Because i have been reading an article that there's a start up company called wright electric that wants to build an all electric airliners

For example easyjet wants to fly passengers in a electric airliners in the next decade does that mean airlines have to cancel their orders from boeing and airbus

Because the way i see electric planes not viable because batteries are heavy i know technology improves does it take a long time for planes to evolve the way we travel because we still use planes from the 1960s that fly slow

Can I bring food I buy on the other side of security onto an airplane?

Basically I'm flying into Atlanta airport from Guatemala and there's a Chic Fil A restaurant in the airport. Now it's been 4 months since I've eaten fast food and would love to get me some chic fil a, however I don't have much time (it's a layover), would I be able to bring it onto the plane? I know I was able to bring a Starbucks Coffee onto the plane when I bought it in the terminal once I was through security so would this be the same? This is a very important matter to me