Many types of contracts exist of course, but in real estate the most common are buy-sell agreements, deeds of trust agreements, seller finance agreements, investor loan agreements, and, of course, Landlord Tenant Agreements.
Here's a list of these different types of Agreements, with some basic information about what you should consider for each type of agreement:
Let's Start with the most basic, the Landlord Tenant Agreement.
Commercial Leasing is very different. Every commercial deal is unique.