Some
webmasters claim that their keywords are bold or put their keywords in italics
is a positive ranking factor in terms of optimizing search engines for a page.
It
is essentially impossible to prove this, and I think these days, Google could
use this very well (and others easily identify in page optimization efforts) to
determine to do a website punish them to not promote them in SERPs.
All
you can "optimize" your page - Google will use it against you to
filter the results.
I
use bold or these days specifically for users cursive.
I
only use the focus when it is natural, or that
is really what I want to emphasize!
Do
not tell Google what you should sneak easily.
I
think Google is dealing with sites that have quite a different trust each other
in a certain respect.
In
other words, the most reliable websites that are not treated differently on
untrustworthy sites.
Keep
it simple, natural, useful and random.