Flight - I flew to Cairo directly from Nairobi on EgyptAir. It was a 4 hour nonstop flight.
Covid Test - has to be taken within 72 hours and the certificate presented at the airport.
Yellow Fever Certificate - I always carry mine whenever I travel and this time around it came in handy as it was requested at the airport in Nairobi.
Visa - you can get an Egyptian evisa or buy it at the airport in Cairo for $25. I opted to buy it at the airport in Cairo. I was concerned about getting change back since I didn't have the exact amount but it turned out not to be an issue.
Currency - in Egypt they use the Egyptian pound and the exchange rate in dollars is 15 Egyptian pounds for every dollar.
Language - English is widely spoken in the touristic areas and from my observation, so are Spanish and French. I did not experience any language barrier.
Accommodation - there are plenty of hotels, guest houses and airbnb's to choose from. I stayed at a guesthouse that I found on booking.com in Giza right by the pyramids.
Dressing - I would say dress in what you are comfortable in and what is weather appropriate because temperatures can get pretty high. I saw a mix of everything in the big cities in terms of clothing but It could be different in smaller cities.
Best Time to Visit - Temperatures are cooler and more comfortable between October and April so for me personally this would be the ideal time to visit if you want to avoid excessive heat.