Allah says in Surah Al-An'am 6:151 - 153:
151: Say, "Come, I will recite what your Lord has prohibited to you. [He commands] that you not associate anything with Him, and to parents, good treatment, and do not kill your children out of poverty; We will provide for you and them. And do not approach immoralities - what is apparent of them and what is concealed. And do not kill the soul which Allah has forbidden [to be killed] except by [legal] right. This has He instructed you that you may use reason."
152: And do not approach the orphan's property except in a way that is best until he reaches maturity. And give full measure and weight in justice. We do not charge any soul except [with that within] its capacity. And when you testify, be just, even if [it concerns] a near relative. And the covenant of Allah fulfill. This has He instructed you that you may remember.
153: And, [moreover], this is My path, which is straight, so follow it; and do not follow [other] ways, for you will be separated from His way. This has He instructed you that you may become righteous.
Let me number them for you:
We don't necessarily see it as strict rules, I would prefer to say what Allah says in Surah Al-Mutaffifin 83:26, "So for this let the competitors compete.". True Allah is the judge, he also mentions the rules - let's compete and earn Paradise by trying to follow it all, insha'Allah.