The contents of this site are licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. That link is to a well-thought-out human-readable version of the license that does not require you to speak legalese to understand it, so I do actually recommend you have a look at it.
This site is dedicated to Bible teaching, offered freely to all; this is a ministry of grace. For this reason, while the copyright of the materials of this site does allow for reuse of these materials in essentially any way you want, you cannot charge for them; further, any time you make use of these materials in a substantial way, you must make your work also freely available to all, under this same license (see copyleft). (If you are merely citing small portions here or there, that is subject to fair use, and while you would thus have to give attribution where it is due, you would not be be bound by the noncommercial clause).
You may find information on best practices for the attribution of Creative Commons works here.