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The first thing to decide is whether you wish to be a computer user or a software developer. If the choice is "user" (.e.g., user of Excel, Word, Facebook, etc.), then you can get some free on-line courses and software to experiment and learn with. Also, most community colleges offer courses on these topics.
If you wish to be a developer (write programs), then you will need to take some programming courses and learn to design and implement software. The software may run on a desk-top, laptop, tablet or phone. In the latter cases, the software is called "apps." Becoming a developer takes longer but pays better and provides more job opportunities.
Hope this helps.