If you wish you can try digital marketing course or some communication course.
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.
You can checkout COURSERA,UDEMY AND SKILLSHARE. But it’s paid.
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
You can download swayam app. It's a MHRD initiative which provides free certificate courses in different fields
Certificates don't matter always if u acquire enough skills from those courses. U can audit courses on Coursera
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
Sorry arushi but there is nothing related hotel management online. Try something else.