This one is simple, knowing your rights from the start is of utmost importance. When you buy a home, start down the road of leasing to tenants, there are rights and responsibilities that you should be aware of when creating a lease and deciding how you are going to be interacting with those you sell to. if you haven’t already here are some guidelines to making sure your prepared and protected.
https://www.mass.gov/guides/the-attorney-generals-guide-to-landlord-and-tenant-rights