Engineering

There are a ton of courses available for learning. Your aim should be not just to study a course for the sake of putting it in your resume but also to do as many projects as you can. This will help you build your portfolio. Such a portfolio will attract employers and academic institutions alike. Anyone can mention they know a list of skills, but only a few can prove it. In my personal opinion, simulation or automation courses are the best BET as we are currently moving towards an era where computers are integrated with engineering systems. Areas such as maintenance engineering and shop floor engineers will be replaced by automations in future.
Employers are already preferring engineers who can code and simulate systems. However, to choose the best course to tailor your needs, you must pick one based on your favorite subject that you studied while doing your degree. Let us assume that your favorite subject was thermodynamics. Then your best BET is to choose a course like CFD or HVAC systems. If you have a good mathematics base, choose to study some programming languages or numerical analysis courses. A popular choice is MATLAB/Python. Do not make the mistake of choosing the most popular course just to go with the herd. Stick to your strengths, choose a particular field and master it.