What are some common etiquettes that people never follow?

I have listed a few things that I consider most important.

1. Failure to respect elders.
2. Smoking, urinating, and spitting in public places.
3. Lack of patience. For instance, even after having reservations, people rush to board a train or flight.
4. Forgetting the roots. Many people talk in English only though they know their mother tongue. After reaching good position in society, many ignore their parents and the past.
5. Minding the material welfare in future only at the cost of own health, and forgetting the plaesaures of present life.
6. Last but not least, selfishness overlooking the rights of fellow citizens and other life forms on this planet.

What is the best way to help someone in need of money who is asking for it on the street?

Ask the person as to the purpose of seeking money. If it is for food or clothes or medicine, try to buy such items by yourself and give to them( if you can afford).

If the purpose is to meet daily needs, better guide him to either find some works to earn with own efforts or approach a social service organisation who will have permanent solution to such poor people.

Never ever help a person with money as it becomes a habit involving laziness and carelessness.