Answer 1

Swathi Amu
AI is a big and complicated topic, involving algorithms, deep-learning etc.
There are several uses of AI so it would be best to specify what exactly you are planning to make.
For example, if you want to create a simple AI that can ‚understand‘ voice commands to, e.g. toggle an LED, you could choose python with libraries that can handle stt (speech to text) to convert the voice command to words, numpy or lists to scan for hotwords, functions triggered by hotwords to execute certain commands (turn the led on) and maybe tts (text to speech) to give some verbal output.
Concerning the libraries, you could use Google‘s Text to speech and numpy (fast keyword detection). I haven‘t used voice-to-text libraries or libraries for mashine learning so far, so maybe someone else could help you on that.
Hope this helps :)

Answer 2

You can start with Python with Tensor Flow or scikic learn
But AI need a lot of theory knowledge or math which you can find in Stanford University free courseware