A great site that explores the power of "taking in the good" with the support of current neuroscience expertise is from Dr. Rick Hanson: Check out his site and subscribe to his weekly newsletter that has very practical steps for harnessing good experiences while releasing the negative ones.
Another good site for meditations is zenworlds.com. Try searching a specific topic like "boundaries" or "anger".
It's as easy as breathing! Try these 5 easy yoga breathing techniques. Try searching youtube for videos.
effective technique to managing anxiety and depression is
"deconstructing" your negative thinking. Cognitive behavioral
strategies encourage you to journal your negative thoughts. For some guidance see: