How do I know if a street food stall is safe?

Watch the turnover. If you see a constant stream of customers and the cook is handling food with tongs or gloves rather than bare hands, it is likely safe.

Is it rude to take photos of my food?

In most casual settings, no. However, avoid using a massive professional camera or flash. If the stall is incredibly busy, be quick so you don't block the flow of other paying customers.

Eat in a New City Like a Local

To eat like a local, avoid the main tourist squares and walk at least four blocks away from the primary attractions. Seek out places where the menu is limited to five or fewer main dishes and look for spots where patrons are eating alone or in quick groups rather than sitting for long, staged meals.

Look for the 'No English' menu. If a restaurant has a menu in four different languages outside, keep walking. Authentic local spots usually have a menu in the local language, often written on a chalkboard or a single sheet of paper.
Follow the shift workers. Identify where taxi drivers, construction workers, or office staff are grabbing lunch between 12:00 PM and 1:30 PM. They prioritize speed, value, and flavor over ambiance.
Master the queue. If you see a line of locals waiting for a street food stall, join it. Locals know which vendors have high turnover, which ensures the food is fresh and the ingredients are constantly replenished.
Ask for recommendations, but be specific. Don't ask 'Where is good to eat?' because locals will send you to a tourist trap. Instead, ask 'Where do you go for dinner with your family on a Tuesday night?'

How do I know if a street food stall is safe?: Watch the turnover. If you see a constant stream of customers and the cook is handling food with tongs or gloves rather than bare hands, it is likely safe.
Is it rude to take photos of my food?: In most casual settings, no. However, avoid using a massive professional camera or flash. If the stall is incredibly busy, be quick so you don't block the flow of other paying customers.