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Anyone who can give a suggestions of any good Augmented Reality software, or maybe a good course /tutorial about Augmented Reality? Thank you so much!

Vuforia should be a good start. - https://developer.vuforia.com/

I personally use it with unity because I'm familiar with the game engine so its a lot easier in adapting.
Vuforia also has sdk for android and ios if you're more comfortable in coding.

I heard metaio is also good but I haven't tried it. When I looked for tutorials on youtube, its more complicated than vuforia.

I hope this helps you out.

Thanks Yuri, that will be a good start! Max rep given. :)

Sharing some tutorial of vuforia + unity will be highly appreciated :)

Thanks again.