Learning Guides

From basic operations to advanced techniques for the web and mobile apps

1. STEP 1◇Beginner
   01I Stopped Asking Claude to 'Cite Sources' — Three Ways I Ask Instead02Let Claude Draft the Quote's Wording, Keep the Numbers in Your Own File — A Small Source of Truth and a Check Script03I Kept Rewriting My First Request to Claude Until I Handed It One Page About My Work04Paid for Pro but still on Free? Where you bought it decides which screen to open and where to cancel
2. STEP 2◆Intermediate
   05Claude Said the File Was Created, but the Folder Was Empty — A Read-Back Check After Every Write06claude-sonnet-4-5 stops on November 30 — I checked the bill before calling its replacement cheaper07Where to Put an Instruction That Keeps Coming Back: Chat, Style, Settings File, or Hook08Claude Card Declined: A Complete Troubleshooting Guide for Pro, Max, and API Users
3. STEP 3◈Advanced
   09What to Settle Before Watermarked Claude Text Ships Inside Your AppPREMIUM10Semi-Automating Firebase SDK Upgrades with Claude on Xcode — Implementation Notes from Six Indie iOS AppsPREMIUM11Make Claude Your Production Debugging Companion: A Practical Design for Log Triage, Hypothesis Generation, and Repro ScriptsPREMIUM12Claude Sonnet 4.6 vs Opus 4.6 — A Task-by-Task Selection Guide From Daily UsePREMIUM

From CLI tool setup to plugin development

1. STEP 1◇Beginner
   01If You Wrote MCP Allow Rules as Just `mcp__servername` — Three Lines to Recheck After v2.1.29902Two Default-Model Changes Haven't Reached Claude Code's Stable Channel YetPREMIUM03The Week Opus 5.5 Became the Default, I Counted the Places I'd Left as Aliases04I counted 42 skills on my shelf, and four of them were just a note saying they had moved
2. STEP 2◆Intermediate
   05The Page Was 90px Too Wide at 375px, and the Culprit Never Showed Up in querySelectorAllPREMIUM06I Added the allow Rule and the Prompt Still Appears — Reading Six Layers from /permissions07The Hook That Was Meant to Guard My Japanese Folder Never Blocked Anything — Python Was Reading stdin as cp93208The Same Approval Prompt for 'cd, git add, git commit' Every Time — Following It to a Design Choice, Not a Missing Setting
3. STEP 3◈Advanced
   09I Set onFailure to block, and the Docs' rm -rf Guard Still Let Everything Through Without jq10Grep's First 250 Lines Touched Only 42 of the 183 Files That MatchedPREMIUM11Taking Inventory of Worktrees That Were Supposed to Be GonePREMIUM12The One File I Keep Out of Claude Code's Reach: project.pbxprojPREMIUM

Guide to task management and file operation automation

1. STEP 1◇Beginner
   01I Put a Ten-Line Promise File at the Top of the Folder I Gave Cowork02Write Access Came Third: The Order I Hand Folders to Cowork03The scheduled task that only ran on days my desk was awake04Using Aqua Voice for Cowork and Everyday Messages — What Changed When I Started Speaking Instead of Typing
2. STEP 2◆Intermediate
   05I Sorted 32 Connector Tool Names Into Read, Write and Delete — Four Wouldn't Sort by Name06When a Scheduled Task Keeps Saying SUCCEEDED but Produces Nothing, Check Outbound Traffic in the First Minute07Visible in the Listing, Zero Hits by Name: Counting Japanese Filenames With Split DakutenPREMIUM08I Stopped Making Cowork Read My Whole Troubleshooting Notes — Pulling One Section by Number Cut 105 KB to 1.5 KB
3. STEP 3◈Advanced
   09I Preloaded a Scheduled Task with head -150: 15.6 KB Read, 3.3 KB for TodayPREMIUM10The Token-in-URL Way of Authenticating git Stopped Working in One Scheduled TaskPREMIUM11Until I planted a failing sample, my unattended checks had never once failedPREMIUM12I verify what my Cowork memory claims instead of trusting its timestampPREMIUM

API integration quickstart for developers

1. STEP 1◇Beginner
   01Sending 40 Rows From Make to the Claude API Stops at Row 14 — Avoiding the 429 With One Subtraction02Don't Hand Your Agent the Tool That Commits — Sorting Tools Into Advise, Prepare, and Commit03The September Price Increase for Sonnet 5 Isn't Happening. Rebuilding a Forecast I Got Wrong in July04Claude Pro/Max Billing and Payment Errors: A Complete Troubleshooting Guide
2. STEP 2◆Intermediate
   0543 Days Until Sonnet 4.5 Retires: I Counted Callers From the Usage CSV, Not From grep06The Morning WS Came Back Empty in a Scheduled Task, and I Learned There Were Two ShellsPREMIUM07A 429 With retry-after: 120 Makes the Anthropic SDK Try to Wait 120 Seconds08Haiku 5.5 is cheaper per token, but your bill jumps fivefold past about 77k Haiku 4.5 tokens
3. STEP 3◈Advanced
   09I Send Images Twenty at a Time — The Day the 21st Image Changed the Rules for the Other 61PREMIUM10Read the Catalog Your CLI Already Ships Before Bulk-Replacing Model IDsPREMIUM11Swapping Tools Mid-Conversation Without Losing Your Prompt CachePREMIUM12The 400-Character Preview That Was Still Holding On to a MegabytePREMIUM