Hello Advaith and welcome to CiC.
In answer to some of your questions, for example about sensors, please go to the Tutorials section of the site. The tutorials, written by site owner Sean (McQ), are widely regarded as amongst the best that are available on the internet.
I hope you enjoy being part of the forum.
If you ever need any help in getting images posted into your message, then please do read the helpful guide that walks you through how to do it. Click HERE to read the thread.
Something else you might find useful. Sometimes people are not sure about asking for comments and criticism on their images. This thread gives you some helpful advice and guidance about how to get the best feedback from fellow members.
By the way - If you wish you can go to Edit Profile and put in your location, so that it appears in the sidebar alongside your message, just like mine beside this message. Then everybody knows where everybody else is.