I think this question is heavily location-based so even though we do have companies posting jobs on LinkedIn here in Korea, that is definitely not the go-to platform for job hunting.
Plus, apart from general job portals there are industry-specific resources usually available (e.g. dedicated job hunting websites for developers, teachers, etc.)
I love LinkedIn, but the hardest thing about starting a new job is putting together a good resume. For me, it was the most difficult thing to make a resume and this site helped me a lot: https://www.gotresumebuilder.com/ I think it can help you too