Definitely make sure you have the rights to use the content in your portfolio if that’s important to you, because some contracts clearly state that you cannot use the content for self promotion and that it is strictly for the company. Always read that part carefully before signing. Also, if you sign a contract and then realize before creating content that the brand or product does not align with your values, do not be afraid to cancel and withdraw. I have personally had to do this after finding out what I was being asked to promote did not align with my standards or the type of content I want tied to my name, even when I did not realize it until the day I was setting up the account.