There's a mental health first aid website that is a wonderful resource for EVERYONE!  Below is a link to a recent article that gives 5 suggestions for teens dealing with stress that I believe can be very useful regardless of age. It also gives you the opportunity to sign up for their monthly publication if that is of interest to you.  Please take a look:

https://www.mentalhealthfirstaid.org/2019/06/five-tips-to-help-teens-cope-with-stress/