Sure! Here's an example cache definition:
`caches.open('my-cache')`

That opens (or creates) a cache named my-cache.
You can put items in the cache with .put():
`cache.put(request, response)`

So altogether, a basic caching strategy might look like:
```js
caches.open('my-cache').then(cache => {
  cache.put('/foo', new Response('Hello world!'));
})
```
That would cache the response Hello world! for requests to the /foo URL.
Then later you can retrieve things from the cache with .match():
`cache.match('/foo')`

So altogether, a simple offline fallback strategy with caching might look like:
```js
caches.open('my-cache').then(cache => {
  cache.put('/foo', new Response('Hello world!'));
})

self.addEventListener('fetch', event => {
  event.respondWith(
    caches.match(event.request).then(response => {
      if (response) return response;
      return fetch(event.request);
    })
  );
});
```
That would serve the cached response for /foo if the network is unavailable, and serve the network response if available.
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