If you have the potential, you can honestly tell the interviewer that you have no purchasing experience, but you are self-motivated and want to give yourself a chance to learn and have a chance to rise in the company. Some companies will accept such honest and steady people (but it doesn't mean you are dishonest if you don't tell the truth); Or read the boOK on purchasing first, which contains some things that should be done in purchasing, and then convert it into your own work, and it will be ok. I hope I can help the landlord with a little advice.