NPS is a good platform.
Here are some videos –
What it is – https://youtu.be/sy1bhOdrWhc
There are a few more questions on defined contribution (https://youtu.be/frs43fNgXDo),  
taxes (https://youtu.be/ZKpQ_WZjPRE) 
and how it compares to EPF https://youtu.be/mpPx8pwqTBs
My only concerns are about the compulsory annuity when the market is not developed yet. https://youtu.be/nTtNyUEIw9o
I would have also liked them to stick to passive funds, like when it started.
So at this stage, I would say, put in enough to get the tax benefit and invest additional savings into ETFs.