Strassler\'s blog: theory (Introduction)
In a way explaining Ruth:-http://profmattstrassler.com/2013/09/23/quantum-field-theory-string-theory-and-predictions/
Strassler\'s blog: theory
by David Turell, (4769 days ago) @ David Turell
More theory and calculations:-http://profmattstrassler.com/author/profmattstrassler/