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Definition, anywhere on article, likely ideally as the first usage:
<ref name="myname">{{cite web ...}}</ref>
And then you can use it later on as:
<ref name="myname" />
which automatically expands the exact same thing.
It appears to be impossible to reuse a book reference with different pages with that method however. This is then covered at: en.wikipedia.org/wiki/Wikipedia:Citing_sources#Citing_multiple_pages_of_the_same_source.
To use a different page, see: www.quora.com/On-Wikipedia-how-can-you-cite-the-same-source-more-than-once-without-them-becoming-separate-references/answer/Ciro-Santilli. The best method is:
<ref name="myname">{{cite web ...}}</ref>
and then use {{p}} as:
{{p|myname|p=123}}

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