Key Points:
Istanbul is one of the top cities to visit in the world.
Earth Trekkers has provided a pretty good travel guide for Turkey, but the focus should be in Istanbul.
The primary things to do in Istanbul include: Blue Mosque and Grand Bazaar (1 day), Hagia Sophia and Topkapi Palace (1 day), Bosphorus River Cruise (1 day), Eyup Sultan Mosque, Ancient Walls of Constantinople, and Mosque of Suleyman the Magnificent (1 day).
According to Wikipedia, "Turkey or Türkiye, officially the Republic of Türkiye, is a transcontinental country located mainly on the Anatolian Peninsula in Western Asia, with a small portion on the Balkan Peninsula in Southeast Europe." "Ankara is Turkey's capital, while Istanbul is its largest city and financial centre."
Here we quote the best way to travel in Turkey provided by Earth Trekkers, a very good travel website created by an around-the-world traveler.
Check ChatGPT's answer for alternative itinerary for Istanbul.