#tools

A fake SMTP server with a real inbox: Mailpit captures your app’s e-mails instead of delivering them. Configuration on the Java and Python side, verification by hand and then in CI thanks to its REST API.

A Java stacktrace is 40 lines long; misconfigured, Filebeat turns it into 40 unusable documents. A step-by-step multiline configuration, with a test application that generates real stacktraces, all the way to complete, queryable Elasticsearch documents.

Everything you need to tag your releases with confidence: annotated vs lightweight tags, the commands that matter, and why git push silently ignores your tags.

Essential Vim commands for daily use - modes, motions, editing, macros - plus the power techniques (visual block, :g, dot-repeat) that make it all click.