What are the precautions on keeping a new tenant?

Hi everyone, I have a property left vacant near my house and I do not want to sell that. I have been wanting to keep a tenant (there have been offers lately) but my decision has taken a back seat when I heard about a relative of mine being duped by his tenants and getting wrong on the law side. I know that there are precautions you can take to avoid bad tenants……just drop me a few suggestions or tips to help me keep a good tenant.

Any suggestions would be appreciated (not the unusual ones).