Many learners at all levels make mistakes with these words.
Here are the rules:
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Here are some more examples:
Travel (verb): He travelled through Latin America on his own. I want to travel the world, but I don’t have the money. If I win the lottery, I will travel to every country in the world.
Travel (as a compound noun):The travel agent booked my flight for me. If you don’t know where to go on holiday, you should go to the travel agent and get some brochures. Travel agent: the shop that sells holidays and flights, also the person who works in this shop. Air travel is becoming more and more popular nowadays. One of my main interests is foreign travel. They say that foreign travel broadens your mind
Travels (plural): He documented all of his travels in a journal. My brother writes about all of his travels on a blog.