General guidance; always verify the operating airline and relevant authorities.
Check-in: confirm online and airport deadlines with the airline.
Boarding: arrive before the airline's boarding closure time.
Baggage: cabin/checked limits depend on fare, route and carrier.
Passport, visa & transit: verify official government requirements.
Dangerous goods: batteries, liquids and restricted items are regulated.
Schedule: re-check terminal, gate and timing close to departure.
This is general information, not a substitute for the airline's current rules.