Question: I have finished my M.Sc. in Applied Mathematics in 2016. I wish to pursue a PhD. Currently I am preparing for GATE (Graduate Aptitude Test in Engineering, a master’s-level national entrance exam in India). In this respect, I have a few questions. 

1. If I only have a valid GATE score but no CSIR-JRF NET qualification, will I be eligible for the 25 k funding?
2. If yes to above, is this funding available for any NAAC-accredited university (public or private) in India?
3. Is there any written statement from the government which validates this?

Answer: 
When it comes to knowledge I make the (admittedly vague) distinction between general knowledge anyone in the field would have and specific knowledge that an expert probably would need to look up.  

For the first kind I use pen and paper. Pen and paper is better for learning things by heart and for this kind of knowledge there usually are plenty of textbooks to look it up if necessary.  

For the second kind of knowledge it is usually enough to get the gist of it. That is why I write my notes on my computer. Here it is less important to know it by heart and more important to clearly record a reference for potential future use. Searching through a file directory is easier than trying to find a random piece of paper I might have thrown out. 

Of course given the time, writing a draft on paper and then a final version on your computer is best. However who in academia has time to spare for that?
The support is probably the least relevant part. What you actually need is a structure to organise your notes. 

If it goes well digitally for you, go for it. At the end, it all depends on how you function. I know that if I need to learn something, I better write it on paper than on a machine, unless it's computer programming. But that might not work for you.

There are multiple tools to manage bibliography, with or without the ability to add notes. Just pick the one you like and can work with.