Componentize is a component system for Roblox, optionally using CollectionService for tagging. Here's some example code of a lava brick. You can use functions beginning with Event_ to hook into any event of the linked instance. In this case, Lava is linked to a BasePart. Touched is an event of BasePart. Events connected this way are automatically added to the janitor, accessible via self._janitor.
Check out the Wiki for any API reference and examples.