Why experience is always important for getting a good job, while after getting that job organizations always train their new employees?

I guess experienced individuals observed many ups and downs during their professional career, so they are always ready to face hard tasks in coming future.

Because the internal atmosphere of all organizations are not same and every organization has different goals and method of work

The more we learn the more we know likewise the more experience the better we function or to work. so experience is needed again and again to improve the skills of that particular work.