Since public notary is a state appointed position, each state has different application and training requirements in order for you to be certified. The states Pennsylvania, Florida, Missouri, Colorado, Montana, Oregon, and California all have mandatory training before you can apply for your notary certificate while North Carolina and Nevada do not allow for online training. Every other state has video training courses available online, but do not require training to become an agent. The only exception is Louisiana, where notaries seem to have more power than in any other state and thus require state required exam.
While yes, all it takes is a document application to get your legal seal in most states, being a public notary has much more responsibility than it may seem. It may be fun to sign your name, stamp your legal fingerprint, and get paid but any mistake you make can end up with you being held personally liable. Say you notarize a financial loan document or a property deed that turns out to be fraudulent. You will end up in trouble with the state and most likely lose your title. If you notarize affidavits as an employee of a business, your employer could be held accountable as well.
With training, you will be able to distinguish false documents from true, witness jurat oaths, and sign your name in acknowledgment of the proper certifications. You and your business associates will rest easier knowing the financial loan or mobile travel documents you authenticated are done correctly.