1. Going to Mexico, one needs to learn some basic phrases ("hello", "please", "thank you", "excuse me", "goodbye" and so on). Even if words are pronounced incorrectly or with difficulty, Mexicans see this as a manifestation of respect for their culture and will be more willing to help a tourist trying to speak Spanish.
2. Crossing the road at a pedestrian crossing, one need to monitor the cars carefully: many drivers have a driver's license but have never attended courses, so there is always a risk of getting under the wheels of a self-taught driver.
3. You should not criticize religion or argue about faith with locals, most of whom are devout Catholics - this can greatly offend a person and make him/her your enemy.
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5. Before eating food bought on the street, be sure to wash your hands. This applies to any food in Mexico - often the disease is caused not by bad food but by unwashed hands.
6. In the capital of Mexico, it is not customary to wear flip-flops or sandals - this immediately gives tourists away. This kind of shoes is only good for a beach. Even in extreme heat locals wear more closed shoes.
8. Loss of a visa or passport can lead to a fine, a huge heap of paperwork, loss of time, hassle and spoiled vacations, therefore documents should also be kept in a safe after making copies that can be safely carried outside.
9. It's not recommended to discuss politics, especially if the interlocutor has opposing views. A bitter dispute may arise, especially if the interlocutor supports any political party. If a Mexican himself starts this kind of conversation, it's best to stay neutral.
10. The same can be said about football, which is very popular in Mexico. If possible, one should avoid discussing this sport, especially if the interlocutor is a fan of any club. And if he is, do not criticize his favorite club under any circumstances.
11. In Mexico City, it's better to avoid taking the subway at "Hora Pico" (peak hours) - from 7 to 10 am when people go to work, and from 5 to 9 pm when everyone returns home. In these hours, the subway is really overcrowded, and on hot days it is completely impossible to stay there, which is an ideal time for pickpockets.
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13. Drinking alcohol on the streets is prohibited by law and can result in a fine.
14. It is considered very rude to ask about somebody's income. Many Mexicans live below the poverty line, there is social inequality, so one should avoid this kind of questions.
15. Women should not respond to loud comments on the streets. This male behavior is considered normal even during the daytime on a busy street. 
