# The Stepthrough blog: page 17 > Page 17 of the Stepthrough blog: practical AI guides for small businesses, each with a free hands-on lesson. Source: https://learn.ynteractive.com/content/blog/page-17 · Updated 2026-10-20 · Free from Stepthrough (https://learn.ynteractive.com) Updated October 20, 2026 Practical, plain-English guides to using AI at work: better prompts, email replies you can trust, and automations that do the busywork. Every post points to a free lesson where you build it yourself, one click at a time. - [n8n OpenAI Node Errors: 401, Empty Model List, Raw Braces](https://learn.ynteractive.com/content/blog/n8n-openai-node-errors): Fix n8n OpenAI node problems: "401 Authorization failed", a Model list that won't load, {{ }} sent as plain text, long answers and costs per item. - [n8n Gmail Node Examples: Send, Draft, Wait for Approval](https://learn.ynteractive.com/content/blog/n8n-gmail-node-examples): Five n8n Gmail node setups from real workflows: send a message, create a draft, send and wait for approval, email type and the n8n footer. - [Felo Source Check Template: Free CSV and Question File](https://learn.ynteractive.com/content/blog/felo-source-check-template): Free Felo source check CSV and pricing question file: what each column means, the 7 rows from our run, and how to use them to verify AI search prices. - [n8n $('Node').item.json: Use Data from an Earlier Node](https://learn.ynteractive.com/content/blog/n8n-reference-previous-node): How $('Node name').item.json reaches back to an earlier node in n8n, when $json isn't enough, and examples from Gmail, If and Slack steps. - [Felo Use Cases for Office Roles: Sourced Price Research](https://learn.ynteractive.com/content/blog/felo-use-cases-by-role): Felo use cases for bookkeepers, consultants, agency owners, office managers, marketers, sales and founders: one sourced pricing question, adapted per role. - [n8n Data Mapping Examples: 20 Expressions to Copy](https://learn.ynteractive.com/content/blog/n8n-data-mapping-examples): Twenty n8n expressions from real workflows: sheet columns, names with spaces, webhook body fields, AI output paths, earlier nodes, dates and defaults. - [Felo AI Search FAQ: Pro Search, Sources and Credits](https://learn.ynteractive.com/content/blog/felo-ai-search-faq): How does Felo work? Answers on Pro Search, numbered sources, follow-ups, mind maps, export and Free plan credits, from a real October 2026 run. - [n8n Filter Node Examples: Skip Rows You Don't Want](https://learn.ynteractive.com/content/blog/n8n-filter-node-examples): How the n8n Filter node keeps only matching items: is not empty, equals, contains, number and date conditions, and when to use If instead. - [Felo AI Search: 9 Research Mistakes and How to Fix Them](https://learn.ynteractive.com/content/blog/felo-research-mistakes): Felo research mistakes from a real pricing run: trusting a citation unopened, second-hand prices, skipping the follow-up, Pro left off, and more. - [n8n Information Extractor Examples: 3 Schemas That Work](https://learn.ynteractive.com/content/blog/n8n-information-extractor-examples): n8n Information Extractor examples for leads, invoices and resumes: the Text prompt, JSON example schemas, the model and mapping the output. - [n8n Send and Wait for Approval: A Human Yes in Gmail](https://learn.ynteractive.com/content/blog/n8n-send-and-wait-for-approval): Use n8n Gmail "Send message and wait for response" for approvals: the Approval type, an invoice-over-$1,000 example, waiting and testing. - [n8n Extract from File: Read PDF Text (and Fix 'No Binary')](https://learn.ynteractive.com/content/blog/n8n-extract-from-file-pdf): Read PDF text in n8n with Extract from File, set Input Binary Field correctly and fix "expects a binary file 'data', but none was found". 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You do the same thing on the right, in a practice copy of the real tool. Get it right and it moves on. Nothing touches your real accounts until you're ready to build it for real. [Start learning free](https://learn.ynteractive.com/)