> ## Documentation Index > Fetch the complete documentation index at: https://documentation.onesignal.com/llms.txt > Use this file to discover all available pages before exploring further. # Tutorials & use cases > Explore step-by-step tutorials and best-practice examples to help you implement OneSignal features and boost engagement, retention, and revenue. Now that OneSignal is set up in your app, pick a use case to build. Each tutorial below is a working example you can adapt, grounded in the core concepts shared across every section. New to OneSignal? Complete the [Quickstart guide](./quickstart-guide) first to install the SDK and send your first message, then come back here to pick your use cases. ## Core concepts Every tutorial on this page builds on these foundations. Skim them once and you'll recognize the same patterns everywhere else. Learn how OneSignal identifies users and links them across devices using External IDs. Build audience segments using tag filters and other conditions. Add custom properties to users for personalization and segmentation. Capture user actions and trigger automated Journeys or Wait Until steps. Build automated messaging workflows triggered by user behavior and data. Use user data and preferences to personalize every message. ## Industry strategies Jump to the playbook for your industry, or browse use cases by lifecycle stage below. Many strategies apply across industries. Basic onboarding, retention, trial-to-paid conversion, and win-back strategies for mobile apps. Establish streaks and regular use early. Reward highly-engaged players and re-engage lapsed players. Abandoned cart recovery and loyalty programs. Get readers to complete their profile and pick categories to send them messages they care about. Push for that critical early-win like making a deposit or transaction and 2FA confirmation. ## Onboard new users Set your messaging foundation, collect more opt-ins, and capture meaningful user data in the first session. Set up a Welcome Journey for your app. Drive new players to their first meaningful in-game action with an automated onboarding flow. Ask for permission the right way so more users opt in to push. Have readers pick topics so every message is one they want. ## Engage and convert Trigger the right message at the right moment to move users toward an action. Trigger Journeys with user actions and events. Recover lost revenue with event-triggered abandoned cart reminders. Notify customers of points balances and unlocked rewards to drive repeat purchases. Drive urgency with time-limited sale campaigns. Notify users when products are back in stock. ## Retain and re-engage Keep users coming back, recover lapsed users, and earn long-term loyalty. Reward consistency with daily streak reminders that keep users coming back. Prompt satisfied users for App Store reviews while reducing friction. Prompt users on outdated versions to update via in-app messages. Ensure critical messages are delivered even when push is disabled. ## Operational Always-on infrastructure that runs alongside your campaigns. Send important real-time updates such as receipts, confirmations, or alerts. Send booking confirmations and recovery emails triggered by real-time booking status. Send one-time passwords, magic links, and verification emails for sign-in and authentication. Reduce bounces and improve deliverability with a double opt-in flow. Let users manage their messaging preferences and communication channels. ***