host-logs.txt
My app is <stack> on <host>. Something is going wrong and I need the logs.

Tell me, for this host:
- Where the web server's access and error logs are, and how I reach them:
  file manager, shell, or the host's dashboard.
- Where my application's own errors end up, and whether they're being
  written at all or silently discarded.
- How long logs are kept before they're deleted.
- How to watch new lines arrive while I reproduce the problem.

Then show me how to make my app log errors with enough detail to debug,
without ever showing that detail to visitors.

Set this up before you need it. The worst time to learn where your host keeps its error log is while the site is down.