I’m not sure what I’m doing wrong here.
Have a read through
= https://developer.mozilla.org/en-US/docs/Web/HTML/Element/a
and have close look at the definition of the opening a-Tag
( there is NO /-sign at the END-OF-opening-A-tag )
so change your
<a href="http://www.twitter.com"/>
into
<a href="https://www.twitter.com">
u had a / at the end
Bingo ! Thanks for the advice!