Electronic basics is a broad term. It is important to have a solid understanding of electronics in order to become an engineer. A thorough knowledge of Ohm’s law and KVL, KCL and RCL-circuits is essential. You also need to understand circuit analysis, diodes and mosFETs, amplifiers and programming. Understanding signals and LTI systems, digital communications theory, control system theory and instrumentation is also necessary.
These are some ideas to help you get started.
Williamson Labs Tutorials Electronics Made EASY Electronic tutorials for beginners: Learn basic electronics for free
Free Electronics Tutorials from an Electronics Engineer
Electronics Tutorial Videos in HD!
Tutorials – SparkFun Electronics
You can embed projects all over the internet
Arduino – HomePage