Hello everybody! I worked at a local translation agency for 2 years. So I want to start working as a freelance translator. So with that in mind I opened an account on ProZ and got my first job proposal. They are asking me the CAT tools I can use and the file formats I can work with. I never used CAT tool and I never had to deal with converting a file from one format to another. So I wanted to ask if CAT tools are really a "must" for freelance translator? Is it better to take on jobs after I have learned using one? I would be very thankful to anybody who would be willing to give me advice.