$\ -$ Pedagogical website on Reduced Basis Methods (non-exhaustive list of methods);
$\ -$ Python notebook with explanations on simple examples (driven cavity, Helmholtz equation, advection-diffusion …);
$\ -$ The goal is not to show most efficient implementations but to explain how each method works and which to choose in a given context;
Find the reduced basis method that best matches your problem.
Detailed documentation.
RBM code notebook with easy and concrete examples.