Becoming an expert in Artificial Intelligence is a long journey. You should have knowledge of many fields. The learning path is given below:
Data Science -Python or R, Data Extraction, Data Manipulation, Data Visualization, statistics, and Probability.
Machine Learning - Supervised, Unsupervised and Reinforcement Learning
Deep Learning - Neural Networks and Deep Learning Algorithms.
If you are a beginner go through this Artificial Intelligence tutorial to know more about AI.
Also, if you want to learn AI from scratch you must go through this tutorial:
For getting a job as an AI engineer you should be a professional in AI and you need to have a certificate for proving it, so, you should go for Artificial Intelligence course to make your career rise to the next level.