Hi Hessam. I'm a native English speaker so I hope I can answer your question for you. "travel" is a word that refers to travelling in general. For example, you might say, the travel industry, or, do you travel a lot? A "trip" is an individual event. You take a trip, or, you go on a trip. For example, I am taking a trip to England next summer! A "journey" is all the events that take place while you are going somewhere. This word is used more in stories or movies than in normal conversation. It is often used when talking about a trip where you were walking for a very long time for example.

Hey Hessam, I am a native English speaker from South Africa. My simplest understanding of these words will follow below. I hope it does help you further. 1. Travel: Means going somewhere. The key word here is 'going' to a place or area. 2. Trip: A trip in this case, is the 'place' you go to. 3. Journey: A journey represents the things you go through when you go somewhere or do something.