add basic usage section

src/content/docs/guide/basic-usage.mdx

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+---
+title: "Basic Usage"
+---
+
+Now that you're all setup and running, here's a quick walkthrough of how you can use Atuin best
+
+## What does Atuin record?
+
+While you work, Atuin records
+
+1. The command you run
+2. The directory you ran it in
+3. The time you ran it, and how long it took to run
+4. The exit code of the command
+5. The hostname + user of the machine
+6. The shell session you ran it in
+
+## Opening and using the TUI
+
+At any time, you can open the TUI with the default keybindings of the up arrow, or control-R.
+
+Once in the TUI, press enter to immediately execute a command, or press tab to insert it into your shell for editing.
+
+While searching in the TUI, you can adjust the "filter mode" by repeatedly pressing ctrl-r. Atuin can filter by
+
+1. All hosts
+2. Just your local machine
+3. The current directory only
+4. The current shell session only
+
+## Common config adjustment
+
+For a full set of config values, please see the [config reference page](/configuration/config/)
+
+The default configuration file is location at `~/.config/atuin/config.toml`
+
+1. Keybindings
+
+We have a full page dedicated to keybinding adjustments, there are a whole bunch of options here! Including disabling the up arrow if you don't like it.
+
+Read more [here](/configuration/key-binding/)
+
+2. Enter to run
+
+You may prefer that Atuin always inserts the selected command for editing. To configure this, set
+
+```
+enter_accept = false
+```
+
+in your config file.
+
+3. Inline window
+
+If you find the full screen TUI overwhelming or too much, you can make adjust it like so
+
+```
+# height of the search window
+inline_height = 40
+```
+
+You may also prefer the compact UI mode
+
+```
+style = "compact"
+```