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Using MySQL’s built-in FULLTEXT search as a lighter alternative to Elasticsearch for small-to-medium datasets.
Error handling in JavaScript with try/catch, custom error classes, and handling async errors correctly around await.
Using PHP’s preg_ functions for pattern matching, extraction, and replacement, with practical examples of each.
How systemd-resolved, dnsmasq, and BIND each fit into the Linux DNS stack, and which one actually matches your use case.
How LoRA makes LLM fine-tuning practical on a single consumer GPU by training small adapter matrices instead of the full model, with a working PEFT example.
Singleton, Factory, and Observer explained with real code — what problem each one actually solves, and when they’re the wrong tool.