Cheatsheet

> [!NOTE]
> General info the reader should not miss.

> [!TIP]
> Helpful suggestion.

> [!IMPORTANT]
> Must-know info.

> [!WARNING]
> Could cause problems.

> [!CAUTION]
> Risk of harm or data loss.

{{< details title="Click to expand" >}}
Hidden content revealed on click.
{{< /details >}}

{{< details title="Open by default" open=true >}}
Visible immediately.
{{< /details >}}

{{< tabs >}}
{{< tab "Go" >}}
```go
fmt.Println("hello")
```
{{< /tab >}}
{{< tab "Python" >}}
```python
print("hello")
```
{{< /tab >}}
{{< tab "Rust" >}}
```rust
println!("hello");
```
{{< /tab >}}
{{< /tabs >}}

{{< steps >}}

1. **Install Hugo**

   Download the extended binary from gohugo.io.

2. **Clone the repo**

   `git clone [email protected]:tamnd/brain.git`

3. **Run locally**

   `hugo server`

{{< /steps >}}

{{< badge content="stable" type="info" >}}
{{< badge content="beta" type="warning" >}}
{{< badge content="deprecated" type="error" >}}
{{< badge content="tag" >}}

```mermaid
graph LR
    A[Write note] --> B[brain_on.sh detects change]
    B --> C[git commit + push]
    C --> D[GitHub Actions builds]
    D --> E[Live on GitHub Pages]
```

```mermaid
sequenceDiagram
    Client->>Server: GET /api/notes
    Server-->>Client: 200 OK + JSON
```

$E = mc^2$

$$
\int_0^\infty e^{-x^2}\,dx = \frac{\sqrt{\pi}}{2}
$$

```go
package main

import "fmt"

func main() {
    fmt.Println("hello, brain")
}
```

package main

import "fmt"

func main() {
    fmt.Println("hello, brain")
}

def greet(name: str) -> str:
    return f"hello, {name}"

SELECT title, date
FROM notes
WHERE tags @> ARRAY['go']
ORDER BY date DESC;

hugo server --buildDrafts --buildFuture

[external](https://gohugo.io)
[internal]({{< relref "cheatsheet.md" >}})

- [x] Published cheatsheet
- [x] Added dark mode toggle
- [ ] Write more notes

| Left | Center | Right |
|:-----|:------:|------:|
| a    |   b    |     c |
| 1    |   2    |     3 |

This is a claim.[^source]

[^source]: The source for this claim.

title: "Note title"
date: 2026-05-02
weight: 1                    # sidebar order, lower = higher
tags: ["go", "db"]
draft: false

math: true                   # enable KaTeX on this page