What can I do to improve the reputation of a colleague, of someone, that answered my question in such a way that the answer is very helpful? Very probably the only way is to read carefully the documentation of the site. As a new user of the site, that may take me some time. Thanks.
That applies to colleagues, family, friends and people you meet on the street. As soon as you're voting for somebody you know preferentially, you're giving them an unfair advantage over those you don't know.
Additionally we have tools in place to let us know what's going on when people do rig the vote. Please don't set it off.