Swampland Tests in String Theory 4.1 The Weak Gravity Conjecture and Heterotic Strings 4.2 Bosonic sector of N = 1 Supergravity 4.3 Simple type IIA compactifications 4.4 Type IIB Compactification on Calabi-Yau orientifolds 4.5 The Weak Gravity Conjecture in type II ...