Reference guides from Lleg's study: explainers and how-tos, revised in place.https://lleg.deven-ushttps://lleg.dev/guides/augmented-vs-agentic-engineeringhttps://lleg.dev/guides/augmented-vs-agentic-engineeringAugmented engineering has no standard definition, while agentic engineering does. This guide sorts out the usages, compares the two working styles side by side, and says when each one fits.Sat, 24 Oct 2026 00:00:00 GMTaillmarchitecturetutorialLleghttps://lleg.dev/guides/claude-duet-vs-muse-vs-dotshttps://lleg.dev/guides/claude-duet-vs-muse-vs-dotsClaude Duet is Anthropic's proactive personal agent. This guide explains what it does, how it asks for approval, and how it differs from Meta Muse and OpenAI dots, using the vendors' own pages.Sat, 24 Oct 2026 00:00:00 GMTaillmarchitecturesecurityLleghttps://lleg.dev/guides/sli-slo-sla-explainedhttps://lleg.dev/guides/sli-slo-sla-explainedA beginner-friendly SRE guide to service level indicators, objectives and agreements, with a comparison table, the downtime each "nine" allows, and a real cloud SLA read line by line.Thu, 22 Oct 2026 00:00:00 GMTobservabilitydevopsarchitecturetutorialLleghttps://lleg.dev/guides/rdf-vs-property-graph-step-by-stephttps://lleg.dev/guides/rdf-vs-property-graph-step-by-stepA beginner-friendly comparison of RDF triples (SPARQL, OWL) and property graphs (Cypher), checked on one fact, one class hierarchy and a 1M-edge graph, with runnable code.Wed, 21 Oct 2026 00:00:00 GMTdatabackendarchitecturepythontutorialbenchmarkLleghttps://lleg.dev/guides/robots-txt-explained-ai-botshttps://lleg.dev/guides/robots-txt-explained-ai-botsA reference for robots.txt: the syntax, how a crawler picks a group and a rule, what happens when the file fails to load, how to write rules for AI bots, and what it cannot enforce.Mon, 19 Oct 2026 00:00:00 GMTwebsecuritytutorialbenchmarkLleghttps://lleg.dev/guides/how-an-llm-answers-one-prompthttps://lleg.dev/guides/how-an-llm-answers-one-promptA beginner-friendly walk through what happens between pressing send and seeing the first word, checked with a 135M-parameter NumPy model and real tokenizer counts.Sun, 18 Oct 2026 00:00:00 GMTaillmtutorialbenchmarkLleghttps://lleg.dev/guides/baalda-vs-obsidian-comparedhttps://lleg.dev/guides/baalda-vs-obsidian-comparedBaalda is a new open-source notes app that also keeps plain Markdown files on your disk. A source-checked comparison with Obsidian on collaboration, AI access, price, plugins and maturity.Thu, 15 Oct 2026 00:00:00 GMTaiarchitecturedeep-diveLleghttps://lleg.dev/guides/git-partial-clone-sparse-checkout-step-by-stephttps://lleg.dev/guides/git-partial-clone-sparse-checkout-step-by-stepHow to clone a huge repository without downloading all of it, step by step, with the measured cost of every command and the history commands that quietly download more than a full clone.Wed, 14 Oct 2026 00:00:00 GMTdevopstutorialbenchmarkLleghttps://lleg.dev/guides/grpc-load-balancing-step-by-stephttps://lleg.dev/guides/grpc-load-balancing-step-by-stepHow gRPC decides which backend gets each call, why a TCP-level load balancer leaves servers idle, and four ways to fix it. Every distribution number comes from a local experiment you can rerun.Tue, 13 Oct 2026 00:00:00 GMTbackenddevopsarchitecturetutorialLleghttps://lleg.dev/guides/rest-graphql-grpc-odata-comparedhttps://lleg.dev/guides/rest-graphql-grpc-odata-comparedFour ways to build an API, compared on who decides the response shape, what the contract looks like, how errors and caching work, and how big the bytes are, with a size measurement you can rerun.Tue, 13 Oct 2026 00:00:00 GMTbackendwebarchitecturetutorialLleghttps://lleg.dev/guides/git-sha256-repository-step-by-stephttps://lleg.dev/guides/git-sha256-repository-step-by-stepHow to create a SHA-256 Git repository, move an existing SHA-1 history into one with fast-export, and the exact errors you hit when the two formats meet. Every command was run on Git 2.55.Sat, 10 Oct 2026 00:00:00 GMTdevopssecuritytutorialLleghttps://lleg.dev/guides/observability-from-first-principleshttps://lleg.dev/guides/observability-from-first-principlesWhat observability actually means, how metrics, logs and traces each answer different questions, how a trace is built, where OpenTelemetry fits, and how SLOs turn signals into alerts.Thu, 08 Oct 2026 00:00:00 GMTobservabilityopentelemetrydevopstutorialLleghttps://lleg.dev/guides/home-server-ai-coding-agents-mini-pchttps://lleg.dev/guides/home-server-ai-coding-agents-mini-pcTailscale, Gitea, Hermes Agent and Orca headless, wired into one home server on a single mini PC: a private network, a git remote, and two complementary AI coding agents as systemd services.Tue, 06 Oct 2026 00:00:00 GMTdevopsaisecuritytutorialLleghttps://lleg.dev/guides/muse-gadget-raspberry-pi-setuphttps://lleg.dev/guides/muse-gadget-raspberry-pi-setupA hands-on guide to muse-gadget-sdk, Meta's open-source SDK for building personal AI agent hardware: setup, what commands the agent can actually run, and how pairing security works.Sat, 03 Oct 2026 00:00:00 GMTaisecuritypythontutorialLleghttps://lleg.dev/guides/oauth2-authorization-code-pkcehttps://lleg.dev/guides/oauth2-authorization-code-pkceHow the OAuth 2.0 authorization code grant works end to end: the request/response shapes, PKCE, refresh token rotation, error responses, and where RFC 10017 now says to actually store the tokens.Sat, 03 Oct 2026 00:00:00 GMTsecuritywebtutorialLleg