You can learn if you are prepared to book the time in in advance and also prepared to put some time in during tenancies, even if there’s an agent.
You need to learn about legal responsibilities, costs (which might make it not worthwhile) rents, and things like what makes a good landlord in terms of communication, rapid maintenance when required and the legalities of contracts, notice period and eviction process. You need to understand tax liabilities in a yearly basis and capital gains tax when coming to sell, plus the need to have a vacant property before you market it.
You need to know it’s not easy money and all the hidden costs and risks such as voids, difficult tenants and how hard and expensive eviction can be. It isn’t a case of having the property, paying an agent and then seeing the money roll in with zero effort or time required.
You need to look into agents and know that even if you pay one, you will still need to keep an eye on things and much responsibility lies with you.
Expect to spend time ensuring standards are suitable and maintenance is done between lets and when needed during them.
If you have a mortgage, the ability to make money from this,especially with a sizeable mortgage is pretty low these days.
I wouldn’t categorically say don’t be a landlord. However, just finding yourself one accidentally isn’t really a pro-active choice, but pretty passive. Becoming a landlord needs to be a proactive, informed and active choice.
If you are prepared to get informed and be proactive so that you can deliver a good service to the tenants who pay rent, then it could be for you. If you haven’t got the time or inclination to do it well, just don’t.