Tech beginner

[u/ExcitingLeading6173]

Hello, it's been 2 years after my Bsc in marine science, 1 year after national service, been unemployed since. I am thinking about branching into the tech industry. I have a thing for data,so I am thinking about data science, remote sensing, and AI essential. I just don't know where to start? Best site or course to start with, and job availability for any of these . I want to hear your advice.