The best tip to study Artificial Intelligence is to focus on basic concepts. AI is a vast field and you should have knowledge of Data Science, Machine Learning and Deep Learning all together. So, spend 3-4 months on learning all about these fields then you should pick up a project of your choice and work on it. This will give a hands-on experience which will help you in clearing your interviews.
Start with this complete Artificial Intelligence tutorial and begin your career as an AI engineer.
After this, watch this video tutorial to get the insights of AI:
After studying by this blog and tutorial you would be very much clear with the path of learning Artificial Intelligence.
Also, if you are a complete beginner and want to make your career as an AI engineer then go through this Artificial Intelligence course and upskill yourself.