If you don't like the stress, don't watch, go relax.
But I like the stress. The rest of life has the volume turned down so much...all of old, nothing else ever. The thrill of the turning tides in a hyper-dynamic chess match can really timewarp me to beddy-bye quickly
PWA = Progressive Web App. It's like an app/browser hybrid
The rest of the lexicon that confused you is prolly just proper terms for frontends which you can read about here:
What a an indeed