@xianc78 You'd want to do the same thing pretty much anywhere. A tag and it's relationships are different kinds of data you'd want to keep on their own. You wouldn't want to store tag data on posts themselves
Since querying by tags is also gonna be common it gives you a better opportunity to index it, like he says
@applejack I guess you're right. I do plan on including mods for the site as well.
Here is what I have so far. A table for games, a table for tags, and a table for tag links. Eventually, there will be a table for mods, which is why tag_link either references a game or a mod.