A list of tags and online books...

Can anyone provide me a list of tags useful in HTML whic are not mentioned here in this course? (just like width and height tags used in image tag)
Also please provide which tags can be used inside the other tags (like align tag can be used in paragraph tag and in heading (h1, h2 etc.) tag.
Are there any books of HTML avilable online (preferably free)?

Hey Shyam,
Thank you for your kind help.
The link provided by you is helping me a lot.
Again thanking you,
Ragards,
Dhananjay.

1)http://w3schools.com/
2)Align is not a tag it is attribute...
3)Just type "HTML Free ebooks" in google search....