Some common phrases used very often include: -"Hi, how are you?" or "What's up?" These are used as greetings when you first see somebody "What's up?" is very informal, for friends or family "Hello, how are you?" can be used informally or formally -"See you later" or "Talk to you later" or "See you soon" Used instead of "bye" when you're done talking to someone

Have a look at https://www.youtube.com/watch?v=--564vFIwzs It's a lesson that explains 10 common English expressions. Good place to start. If you keep looking on youtube there's a lot more!

"If you know someone" sounds like you are looking for a language partner. COMMUNITY > LANGUAGE PARTNER, then set filters.

For any situation, i am not looking anything specific. I only want know which phrases are the most used by english speakers.

It REALLY depends on the day! Can you give context on what you'll be doing that day? Staying home with children? Going to the grocery store?