As the amount of activity in your community grows, you'll get more out of it by using these tools to find what you need. In particular, be sure to personalize your home page, using the widgets to filter out the things you're probably not interested in anyway.
Here are some of the tools you can use to find content:
Widgets. Personalize your home page with widgets that display links to the things you want to see. For example, the Watch A Tag widget will filtering out everything except content tagged with the tag you want.
Browsing. One of the easiest ways to browse for content is to use the menus at the top of each page:
Bookmarking. You and others can bookmark content as a way to find it more easily later, but also to point out things you think deserve more attention. You can bookmark content in the community or sites outside it. When you bookmark something, you can add notes and tags for others to use (although you can also make bookmarks personal).
Tags. When people assign tags to content you can use the tags to find the content again. The community displays tags in a "tag cloud" where you can click a tag to see the content associated with it. For example, if you navigate to a space home page (on the community home page, click the Spaces icon, then click the name of the space), you'll likely see a tag cloud of popular tags. Notice that the tags listed there are in alphabetical order, but that they're displayed in different letter sizes. The larger a tag name is, the more content it's assigned to.