Two simple examples of how to use Ohms law
If you want to learn and build your own inventions with electronics, you need to learn the basics of electronics.
Without a good understanding of basic concepts such as current and voltage, it's going to be hard (or impossible) to understand how different circuits work.
But it doesn't have to be hard. Do *not* confuse basic electronics with "all electronics theory that exist". A lot of books and blogs make this mistake. And it's discouraging for beginners.
Basic electronics is easy.
This page is a library of resources to help you learn the real basics of electronics.
An overview of the most used schematic symbols in electronic circuits