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The sans-serif face is a good face to use for short blurbs or in headlines or subheads in web design. This type you're seeing now is a sans-serif.
You can use the "head" tags to create headings. Within the brackets < >, you would use - in order of size - the headings H1 (largest) to H6 (smallest). Be sure to close the tags with /H1 or /H6. For an example of both:
A PAGE ABOUT MY DOG LITTLE BITTY DOG POOKIE (this is H6)
ANOTHER PAGE ABOUT MY LARGE CAT SPOOKY (this is H1)