---
title: "Writing tasks: Introduction"
sidebarTitle: "Introduction"
description: "Tasks are the core of Trigger.dev. They are long-running processes that are triggered by events."
---

Before digging deeper into the details of writing tasks, you should read the [fundamentals of tasks](/tasks-overview) to understand what tasks are and how they work.

## Writing tasks

| Topic                                               | Description                                                                                                               |
| ----------------------------------------------------| ------------------------------------------------------------------------------------------------------------------------- |
| [Logging](/logging)                                 | View and send logs and traces from your tasks.                                                                            |
| [Errors & retrying](/errors-retrying)               | How to deal with errors and write reliable tasks.                                                                         |
| [Wait](/wait)                                       | Wait for periods of time or for external events to occur before continuing.                                               |
| [Concurrency & Queues](/queue-concurrency)          | Configure what you want to happen when there is more than one run at a time.                                              |
| [Versioning](/versioning)                           | How versioning works.                                                                                                     |
| [Machines](/machines)                               | Configure the CPU and RAM of the machine your task runs on                                                                |
| [Idempotency](/idempotency)                         | Protect against mutations happening twice.                                                                                |
| [Replaying](/replaying)                             | You can replay a single task or many at once with a new version of your code.                                             |
| [Notifications](/notifications)                     | Send realtime notifications from your task that you can subscribe to from your backend or frontend.                       |