Computers, Waves, Simulations
A Practical Introduction to Numerical Methods using Python

The maths is hard and may take you a few weeks / months to get back up to speed. I recommend going through differential calculus, multi variable calculus, integral calculus and linear algebra on Khan Academy.

Then, do this course first: https://www.coursera.org/learn/computers-waves-simulations?

After that, you can do the 12 Steps to CFD course from the sidebar.

Hi, what do you think about this one?

https://www.coursera.org/learn/computers-waves-simulations

Learn coding. If you are interested in any specific topic of geophysics, learn these software or packages. An example is in below:

Computers, Waves, Simulations: A Practical Introduction to Numerical Methods using Python

There are a couple of courses on Coursera on doing simulations in python.

Computers, Waves, Simulations: A Practical Introduction to Numerical Methods using Python

Some Jupyter notebooks (python) about geophysics are online here:

https://dgg-online.de/service/online-lehrangebote/

The only real course at this Page is probably: https://www.coursera.org/learn/computers-waves-simulations

Mainly about what is important if you want to simulate stuff (especially seismic waves) and some methods to do it and implement it in python. Based on the book of Heiner Igel (seismology Prof at LMU Munich).

The seismo-live.org page has a lot of geophysics Notebooks, but they are arbitrary,independently chosen topics and not like a course.

Edit: it’s a German website but all the notebooks are in English.