# Docker, The Hard Way

In this series, I wan't to share what I know about Docker.

> This is the __Hard Way__ of learning Docker. if you are in hurry, this tutorial might not be a good choice for you


What should you know before using Docker?

There are couple of things you should now, before diving into Docker:
   - How OS Works
   - What is Linux (Kernel)
   - What is Virtualization
   - Init System, Systemd, PID 1 and Signals

When using Docker, we also use __Network__ and __Volumes__ to interact with it. we also use __Shell__ a lot. so, for the first step I'm going to talk about these stuff.



## OS and Linux:

blah blah


### How OS works

blah blha

```shell
echo 1
```


```python
print 1
```

```js
var i = 1
```