Are you referring to training courses? QuickBooks Online for Accountants has QuickBooks Online Courses for you to be a certified ProAdvisor. You can access and take them from your QBOA account. Simply go to the ProAdvisor tab and select Training. I've added these links for more details:
We also have video tutorials for QuickBooks Online. This is very helpful to all small business owners. Aside from that, our QuickBooks Online Help will give us more articles that'll help in managing your business and account.