Hi Rakesh, to answer your question, no there is no "basic Moodle" unless you call what is directly out of the box the basic edition.
While the answers you already have cover the main issues, they miss two fundamental points, I suggest. We forget sometimes that when we started, certainly with me, Moodle was a awful lot simpler to learn and use.
Moodle has had to grow over the last 19 years, and with that growth comes an increased complexity in use, tools, security and therefore administration. In response, or perhaps as an adjunct to, that increasing complexity, Mary has pointed out the ready availability of videos and MoodleDocs
to cover the essential admin concepts and some guides.
The other issue we usually overlook is that the environment in which Moodle runs had also undergone similar transformations. There is much more to learn about setting up and running not just the Moodle but the entire environment, making sure it all plays nicely together. In turn, this also impacts on the Moodle, taking advantage of newer technologies, like mobile Moodles and I am sure others will come along, like Moodle on a smart watch for example.
The only advice that can really be given here is to build a test site then sit and play with it. Break it, if you can, reinstall it, fix something, add something, take something out. See what happens. In the meantime, just keep your production site running in the out of the box mode, it should pretty well run on its own with a minimum of fuss, as along as you don't change anything. You can pick up on the basics pretty quickly, and make sure you test everything on your test site before you do anything on your production site.