How many times we can use this H tags in single page - H1,H2,H3,H4,H5,H6

[kethyjewel]

I am new in SEO Field. So please anybody give me some information about H tags - H1,H2,H3,H4,H5,H6 . 

[Conet]

You can use H1 tag only once. It's the main heading. Then, others (h2,h3...) can be used any times. They are also heading, so it must be nested.

[LitheInvestor]

Use H2 and H3 tags for the title of articles, H1 is too large for this and search engines punish using H1 more than once per page