I have earned points on Stack Exchange for Database related. How do I transfer those points to dba.stackexchange?
Reputation is a rough measurement of how much the community trusts you; it is earned by convincing your peers that you know what you’re talking about. The more reputation you earn, the more privileges you gain and the more tools you'll have access to on the site - at the highest privilege levels, you'll have access to many of the same tools available to the site moderators.
If you know programming, does it mean you will be able to talk about bicycles?
The short answer is, you can't. Reputation is specific to each individual site and marks how thorough your knowledge is on the site's subject. While you do earn the association bonus to get past the basic new user restrictions, you have to gain reputation on each specific site to gain the privileges that heavily affect the site's content.