Sure, I'd be happy to help. Delhi, Agra, and Jaipur form the famous "Golden Triangle" of India, each city offering unique experiences. Here are some tips for your trip:

Best Time to Visit:
The ideal time to visit these cities is between October and March when the weather is cool and pleasant. The summer months from April to June can be extremely hot.

Route and Accessibility:
Begin your journey in Delhi, from where you can take a train or drive to Agra, which is about 230 kilometers away. From Agra, Jaipur is about 240 kilometers and can be reached by road or train.

Altitude and Acclimatization:
All three cities are situated at low altitudes, so you don't need to worry about altitude sickness or acclimatization.

Accommodation and Booking:
There are plenty of accommodation options in these cities, ranging from luxury hotels to budget guesthouses. It's advisable to book your accommodation in advance, especially if you're planning your visit during the peak tourist season.

Clothing and Essentials:
Light, breathable clothing is recommended for the day, with a light jacket or shawl for the cooler evenings. If you're visiting in winter, do take warmer clothing. Comfortable shoes are essential as there's a lot to explore on foot. Don't forget your sunglasses, hat, and sunscreen.

Health and Safety:
Avoid drinking tap water. Stick to bottled water to avoid any health issues. Make sure to have travel insurance in case of any emergencies.

Local Etiquette and Respect:
Indians appreciate respectful behavior. Dress conservatively, especially when visiting temples or other religious places. Tipping is common but not mandatory; however, a small tip to service staff is always appreciated.