Liquid is a templating language used by 11ty (Eleventy) for dynamic content generation. Here's a brief overview of some Liquid template basics:

### Variables:

```liquid
{{ variableName }}
```

Example:

```liquid
{{ title }}
```

### Filters:

```liquid
{{ variableName | filterName }}
```

Example:

```liquid
{{ date | date: "YYYY-MM-DD" }}
```

### Tags:

Control flow and logic with tags:

```liquid
{% if condition %}
  <!-- Content to display if condition is true -->
{% endif %}
```

Example:

```liquid
{% if page.title == "Home" %}
  Welcome!
{% endif %}
```

### Loops:

Use `{% for item in array %}...{% endfor %}` for iterating through arrays.

Example:

```liquid
{% for post in posts %}
  {{ post.title }}
{% endfor %}
```

### Includes:

Reuse code with `{% include "filename" %}`.

Example:

```liquid
{% include "header.html" %}
```

### Layouts:

Create layouts with `{% layout "layoutname" %}` to structure pages.

Example:

```liquid
{% layout "base.njk" %}
```

### Data Files:

Supply data from JSON or JavaScript files.

Example:

```liquid
---
layout: "base"
---
```

### Collections:

Group related content into collections for easy iteration.

Example:

```liquid
collections.posts
```

### Custom Shortcodes:

Define custom reusable snippets with `{% shortcode %}`.

Example:

```liquid
{% figure src="/img/image.jpg" alt="Description" %}
```

### Conditional Output:

Use `{% if variable %}...{% else %}...{% endif %}` for conditional rendering.

Example:

```liquid
{% if page.author %}
  Author: {{ page.author }}
{% endif %}
```

### Template Layouts:

Organize content within templates using layout files.

Example:

```liquid
{% extends "layouts/base.njk" %}
```

This is a basic overview, and Liquid supports more features and functionalities. Refer to the official Liquid documentation and 11ty documentation for more in-depth details and examples.