Tags, elements problem

I jyst started to learn web development, when i used atom text editing to try the tags, elements and visualize it on browser the tags wasn’t translated.
Ex. The tags of em element or the p element was written as it is i didn’t find any italic font or any paragraphs.
Any help please

Check the file extension. Did you save the file as .html or .htm?

Thanks alot, yes this was the problem.

Glad I could help. Thank you.