1. Preparation of documents:

Passport and visas
Tickets and booking confirmation
Medical insurance
2. Luggage:

Suitcase or backpack
Change of clothes for every day
Shoes suitable for all occasions
Hygiene supplies
Chargers for electronics
3. Health Care:

Medicines and first aid kit
Prescriptions for medicines, if needed
4. Finance:

Cash and credit cards
Copies of documents stored in a separate location
A wallet with small denomination bills
5. Information and Contacts:

Contacts of the embassy or consulate in the host country
List of emergency numbers
Download important applications to your phone (maps, translators, etc.)
6. Reservations:

Hotel bookings
Booking of transport (taxi, car rental)
Electronic tickets and receipts
7. Entertainment and Activities:

Book or tablet
Headphones
A camera or smartphone for taking photos
8. Cosmetic bag:

Toothbrush and toothpaste
Hygiene products
Cosmetics, if you use
Hairpins, comb
9. Think About Clothes:

See the weather forecast and choose clothes accordingly
Comfortable shoes for long walks
An umbrella or raincoat, if the forecast is as follows
10. Specific Needs:

Snacks or water if traveling with children
Special items for long-haul flights (pillow, blanket)
Do not forget to adapt the checklist to your personal needs and the specifics of a particular trip.What would you add to my list? Is there something superfluous here? Was it helpful for you?