Please tell me the website address where I can learn by watching pranayama, kapalbathi, anulom vilom etc.

It would be a good idea to learn it from a pranayama teacher, I don't know of a website but you can get a DVD by Ramdev ji or from this site, it gives you a full scientific explanation of how pranayam helps in making you healthy AND shows you how to do each pranayam and its timing. Once you understand the whole concept then you would not only do it consistently but also will enjoy it. Happy Sadhana !!!