A less rigorous, but fast primer on SDEs
An Infinitesimal Introduction to Stochastic Differential Equation Modeling
SDE.pdf
https://www.peterholderrieth.com/blog/2023/Diffusion-Models-with-Stochastic-Differential-Equations-A-Introduction-with-Self-Contained-Mathematical-Proofs/
(Universitext) Bernt Øksendal - Stochastic differential equations_ an introduction with applications-Springer (2010).pdf