Certified courses usually require some kind of payment, so none of them eould be fully free. Try Udemy skill share. You could aslo try coursera and even Harvard has started a few courses,you could try these
For hotel management most of the courses will be paid or if you have to do any other course free cost you can try on Google they provide many free courses
If you wanna pursue the chef line, then you might try taking some professional cooking classes otherwise it's all about your practical knowledge and skill set.