NPTEL is the platform where I can get every thing related to engineering knowledge.
I used NPEL in 4 years of my engineering and got a huge advantage.
I am currently using NPTEL for my GATE prepration for building concepts.
NPTEL has very good content for branch to branch and subjects series.
All video lectures and pdf notes are designed in well sequence and high quality.
The best part of NPTEL is its online learning courses and certificates.
NPTEL dont take long time to load its fast even in mobile too.