I have already talked about the excellent Huberman Lab podcasts (my post is here). Dr Huberman is professor of neurobiology and ophthalmology at Stanford University School of Medicine.
Now I can also recommend his free monthly newsletter.
Each one is a short easy to read summary of actionable steps to help you improve your health, wellbeing and physical fitness.
Sure, there are plenty-way-too-many similar offerings in this space, but this one (IMHO) is particularly valuable as it offers quality evidence based information.
To give you some idea of the sort of tools contained in the newsletters here is a sample of Decembers offering:
Here is the link to sign up: Neural Network Newsletter.