You can try to visit some website as cousera.org, academy or curiosity.

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Web Learning is essential if we are online..And Learning from teachers is essential when we are offline..I mean During academic timings learning from teachers is must..and during surfing internet...web learning can be helpful..

In my view Web learning is a source available whenever we want..and teachers are available when they only teach..:p..

ya of course web learning replaces the teacher's.but this is some time good and some time creates lots of problem.problem in the sense is that ,if any student learning from lecture's and at particular instant of time,if he/she find some difficulties then at that moment,we need teacher for proper understanding.also web learning is good when someone miss his/her classes then at that time he/she go for video lecturer.in both cases it replaces the teacher's.

Web Learning can only support your learning through teachers. It will be very tough to replace the teachers. From teachers, you learn many other things other than the subject knowledge.