---
language: sage
category: Tutorial / Help
---
title: Embedded Help
descr: |
Sage has extensive built-in documentation, accessible by typing the name of a function or a constant
(for example), followed by a question mark:
```
log2?
```
code: log2?
---
title: Help Function
descr: >
It's also possible to use the `help(...)` function.
code: help(log2)
---
title: SageMath Documentation
descr: |
Here are some links to the SageMath documentation:
* [Main Index](http://doc.sagemath.org/)
* [Sage Tour](http://doc.sagemath.org/html/en/a_tour_of_sage/index.html)
* [Tutorial in English](http://doc.sagemath.org/html/en/tutorial/index.html)
* [Thematic Tutorials](http://doc.sagemath.org/html/en/thematic_tutorials/index.html)
* [Reference Guide](http://doc.sagemath.org/html/en/reference/index.html)
* [Constructions](http://doc.sagemath.org/html/en/constructions/index.html)
code: ""
---
title: Community Help
descr: |
Here are places on the internet where you can get help:
* [SageMath Support Group](https://groups.google.com/group/sage-support)
* [Ask SageMath](http://ask.sagemath.org/)
code: ""
---
title: Tab-Completion
descr: |
To learn more about possible operations on an object or existing functions and classes,
first type in the variable, then a dot, and then press the [`TAB` key](https://www.google.at/search?q=tab+key).
The tab key can either autocomplete your current input at the position of the cursor,
or give you a list of possible completions.
In the given example here, position the cursor after the dot and press the `[TAB]` key.
Autocompletion also works for partial strings and pre-defined objects.
In the second and third example, you can either all implemented Graphs or tab-complete a specific function.
code: |
# press the tab key after placing the cursor right next to the "."
%var x
ex = 2*x/sin(x)
ex.
# for implemented graphs
graphs.
# or place the cursor after "Group" and press tab
Group
