@Jennifer Moraski There is a plethora of sources to choose from regarding both sites and literature on commercial leases. Some are good but most are not in my opinion. As a commercial broker, and a graduate from the CCIM Institute. I can safely say that commercial leasing is a deep ocean and simply reading a few books can bring you up to speed on terminology and light tactics but will not make you authoritative on the subject. The best source of information on this topic is provided by the CCIM Institute in the form of the class CI-103. However, these classes are not cheap and you will need to complete at least 101 before gaining eligibility to 103.
I suggest you perform some research on what I have mentioned. If you find yourself not prepared to make that type of commitment, then you should begin by visiting sites like CCIM, for commercial in general, NAIOP for Industrial, BOMA, for Office, ULI, for land, and ICSC for retail. All of these sites are the benchmark for those asset types and will allow you access to the most reliable information. Keep in mind, Commercial leases are essentially of three types, and all of the other forms either branch out from them or are under the same umbrella. Namely, Absolute Gross, Hybrid, and Absolute Net. Some asset types inherently use different types of leases depending on market standards. For example, in my area Industrial and Office are usually Gross and Hybrid, while Retail is just about always NNN. There are virtually an infinite number of ways to structure leases and "everything is negotiable". Start by digging into these terms and let the journey begin. Hope this helps!