These are simple self-help methods to make you feel better in the moment, and also reduce the symptoms of stress over the long term by training your nervous system to moderate its stress response.
Sometimes you don't need advice or a technique to reduce stress. Mood is heavily dependent on hormones and neurotransmitters. Endorphins and oxytocin are both known for their "feel good" properties, which are stimulated by laughing hard, and seeing cute, sweet things, respectively. Sometimes all it takes to feel better is surrounding yourself with positive things.