Here are some tools I often use and recommend. Please know that these are only one version of each skill and you may find other versions that suit you better.
Progressive Muscle Relaxation 1
Progressive Muscle Relaxation 2
Mindfulness of the Breath — here is a good place to start learning about mindfulness (pdf here - link is sometimes problematic)
One topic I get asked a lot about is adolescent screen time. In 2023, the APA (American Psychological Association) came out with some recommendations based on their review of research. Here is a link to a 2022 NIMH review of studies about social media use and mental health.