--- title: "#tutorial articles | Hashnode" description: "A tag dedicated for all kinds of tutorials on Hashnode. Read the latest #tutorial articles and tutorials on Hashnode." url: "https://hashnode.com/tag/tutorial" --- Tag # #tutorial 11,642 posts · 65,242 followers [ModelFold](https://hashnode.com/@modelfold) · [1h ago](https://hashnode.com/posts/one-api-key-700-models-why-i-stopped-juggling-vendor-accounts/6af940480270c90d66557468) ### [One API key, 700+ models: why I stopped juggling vendor accounts](https://modelfold.hashnode.dev/one-api-key-700-models-why-i-stopped-juggling-vendor-accounts?utm_source=hashnode&utm_medium=feed) I work on ModelFold. This is a walkthrough of the public catalog and the OpenAI-compatible API as they stood on 14 November 2026. Prices move. Treat the live pricing page as the invoice, not this arti 5 min read · [modelfold.hashnode.dev](https://modelfold.hashnode.dev/one-api-key-700-models-why-i-stopped-juggling-vendor-accounts?utm_source=hashnode&utm_medium=feed) [Vedar](https://hashnode.com/@vedarai) · [2h ago](https://hashnode.com/posts/from-question-to-human-confirmed-request-an-ai-assistant-plans-a-volcano-day-in-kamchatka/6af928dad292ed0c98f6ce54) ### [From Question to Human-Confirmed Request: An AI Assistant Plans a Volcano Day in Kamchatka](https://vedarai.hashnode.dev/from-question-to-human-confirmed-request-an-ai-assistant-plans-a-volcano-day-in-kamchatka?utm_source=hashnode&utm_medium=feed) A step-by-step walkthrough of real MCP tool calls against Vedar Kamchatka's open server, with the A2A equivalent. 9 min read · [vedarai.hashnode.dev](https://vedarai.hashnode.dev/from-question-to-human-confirmed-request-an-ai-assistant-plans-a-volcano-day-in-kamchatka?utm_source=hashnode&utm_medium=feed) [bowen Tse](https://hashnode.com/@bowentse) · [3h ago](https://hashnode.com/posts/a-cup-is-not-a-cup-why-volume-units-need-a-locale/6af922b412bfa1e35dd183f5) ### [A Cup Is Not a Cup: Why Volume Units Need a Locale](https://toolkitloop.hashnode.dev/a-cup-is-not-a-cup-why-volume-units-need-a-locale?utm_source=hashnode&utm_medium=feed) A US cup, a metric cup, and an Imperial pint are three different volumes — so a converter that ignores locale is wrong before it starts. 5 min read · [toolkitloop.hashnode.dev](https://toolkitloop.hashnode.dev/a-cup-is-not-a-cup-why-volume-units-need-a-locale?utm_source=hashnode&utm_medium=feed) [1](https://hashnode.com/posts/a-cup-is-not-a-cup-why-volume-units-need-a-locale/6af922b412bfa1e35dd183f5) [Greenhaven365](https://hashnode.com/@greenhaven365) · [12h ago](https://hashnode.com/posts/compute-realized-volatility-of-a-bitcoin-perpetual-from-public-candlesticks-python/6af8a53156dff0bb021b21b4) ### [Compute realized volatility of a Bitcoin perpetual from public candlesticks (Python)](https://greenhaven365.hashnode.dev/compute-realized-volatility-of-a-bitcoin-perpetual-from-public-candlesticks-python?utm_source=hashnode&utm_medium=feed) Pull confirmed OKX klines for BTC-USDT-SWAP, build close-to-close log returns, and annualize sample realized vol on a stated 24/7 convention. 8 min read · [greenhaven365.hashnode.dev](https://greenhaven365.hashnode.dev/compute-realized-volatility-of-a-bitcoin-perpetual-from-public-candlesticks-python?utm_source=hashnode&utm_medium=feed) [Sebastian Bardach](https://hashnode.com/@bardachtech) · [10h ago](https://hashnode.com/posts/effective-hourly-rate-on-a-retainer-explained-the-formula-that-shows-when-a-client-stops-paying/6af8bed5194a477ff86a12b0) ### [Effective hourly rate on a retainer, explained: the formula that shows when a client stops paying](https://bardachtech.hashnode.dev/effective-hourly-rate-on-a-retainer-explained-the-formula-that-shows-when-a-client-stops-paying?utm_source=hashnode&utm_medium=feed) A monthly retainer has a contracted rate (fee ÷ hours included) and an effective rate (fee ÷ hours actually used). The contract shows the first. Your margin depends on the second. The formula effectiv 3 min read · [bardachtech.hashnode.dev](https://bardachtech.hashnode.dev/effective-hourly-rate-on-a-retainer-explained-the-formula-that-shows-when-a-client-stops-paying?utm_source=hashnode&utm_medium=feed) [Aswani Kumar](https://hashnode.com/@ashwin31) · [13h ago](https://hashnode.com/posts/how-to-auto-grade-sql-exercises-against-a-real-sqlite-database/6af8951fc5d2ed68bb8c0247) ### [How to auto-grade SQL exercises against a real SQLite database](https://ashwin31.hashnode.dev/how-to-auto-grade-sql-exercises-against-a-real-sqlite-database?utm_source=hashnode&utm_medium=feed) Grade students' SQL queries by running each one on the same SQLite database and comparing rows: a 40-line Python grader and five traps to avoid. 10 min read · [ashwin31.hashnode.dev](https://ashwin31.hashnode.dev/how-to-auto-grade-sql-exercises-against-a-real-sqlite-database?utm_source=hashnode&utm_medium=feed) [Ai Game Changer Pro](https://hashnode.com/@aigamechangerpro) · [14h ago](https://hashnode.com/posts/comfyui-make-free-ai-videos-on-your-own-laptop-wan-2-2-guide-no-subscription/6af883310fefbed0562c7841) ### [ComfyUI: Make Free AI Videos on Your Own Laptop — Wan 2.2 Guide (No Subscription)](https://aigamechangerpro.hashnode.dev/comfyui-make-free-ai-videos-on-your-own-laptop-wan-2-2-guide-no-subscription?utm_source=hashnode&utm_medium=feed) Every AI video tool on the web charges you per clip — credits, subscriptions, watermarks. ComfyUI is the way out: a free, open-source app that runs AI video generation on your own computer, with no su 8 min read · [aigamechangerpro.hashnode.dev](https://aigamechangerpro.hashnode.dev/comfyui-make-free-ai-videos-on-your-own-laptop-wan-2-2-guide-no-subscription?utm_source=hashnode&utm_medium=feed) [Hassan Aziz](https://hashnode.com/@hassandevelopment) · [16h ago](https://hashnode.com/posts/terminal-basics-for-vibe-coders-read-before-you-approve/6af8657fafb0dafcace2fa1f) ### [Terminal basics for vibe coders: read before you approve](https://hassanrants.hashnode.dev/terminal-basics-for-vibe-coders-read-before-you-approve?utm_source=hashnode&utm_medium=feed) The Bash commands coding agents run, red flags like rm -rf and sudo, and how to check a command before you approve it. 10 min read · [hassanrants.hashnode.dev](https://hassanrants.hashnode.dev/terminal-basics-for-vibe-coders-read-before-you-approve?utm_source=hashnode&utm_medium=feed) [Rohan Mehta](https://hashnode.com/@rohanmehta) · [18h ago](https://hashnode.com/posts/salesforce-screen-flows-vs-autolaunched-flows-picking-the-right-flow-type/6af84963f7963a7987adc05b) ### [Salesforce Screen Flows vs Autolaunched Flows: Picking the Right Flow Type](https://way2force.hashnode.dev/salesforce-screen-flows-vs-autolaunched-flows-picking-the-right-flow-type?utm_source=hashnode&utm_medium=feed) Salesforce Screen Flows vs Autolaunched Flows: Picking the Right Flow Type Flow Builder offers two main ways to run automation: Screen Flows, which a user walks through step by step, and Autolaunched 4 min read · [way2force.hashnode.dev](https://way2force.hashnode.dev/salesforce-screen-flows-vs-autolaunched-flows-picking-the-right-flow-type?utm_source=hashnode&utm_medium=feed) [Arnold Holm](https://hashnode.com/@stratcorealpha) · [18h ago](https://hashnode.com/posts/buy-the-strongest-coin-3-7-a-year/6af846614e1e70441c468f37) ### [Buy the strongest coin? -3.7% a year.](https://stratcorealpha.hashnode.dev/buy-the-strongest-coin-3-7-a-year?utm_source=hashnode&utm_medium=feed) Buy the strongest coin? -3.7% a year. Buying the strongest coin cost you about 3,700 dollars a year in my test. On a 100,000 dollar account that worst fall leaves you 36,000 dollars down, past your lo 4 min read · [stratcorealpha.hashnode.dev](https://stratcorealpha.hashnode.dev/buy-the-strongest-coin-3-7-a-year?utm_source=hashnode&utm_medium=feed)