Use the Feynman method: Richard Feynman was fond of giving the following advice on how to be a genius. You have
to keep a dozen of your favorite problems constantly present in your mind, although by and
large they will lay in a dormant state. Every time
you hear or read a new trick or a new result, test
it against each of your twelve problems to see
whether it helps.
Gian-Carlo Rota
Homotopical and Algebraic QFT by Donald Yau
Lecture notes on 2-dimensional defect TQFT by Nils Carqueville.
One dimensional topological theories with defects: the linear case by Mikhail Khovanov.
Field Theories with defects and the center functor by Davydov, Kong, and Runkel
Cohomological Field Theory Calculations by Rahul Pandharipande
The unbearable lightness of deformation theory by Balazs Szendroi
Operads and Motives in Deformation Quantization by Maxim Kontsevich
*** Under Construction ***