Begin by navigating to the Google Fonts website (fonts.google.com). Browse or search for the fonts you need. For each font you want to transfer, click on it to access its details page. Here, you can review its styles, variants, and other metadata that you might want to store in your MongoDB database.

On each font's details page, manually extract the necessary metadata. This includes the font name, category (e.g., serif, sans-serif), variants (e.g., regular, bold), subsets, and any other relevant information. Copy this information to a document or spreadsheet for easier management. Ensure you have all the data you want to store before moving on to the next step.

For each font, download the font files. Google Fonts typically provides links to download the font in various formats (e.g., TTF, OTF). Save these files to a local directory on your computer. Ensure that the directory structure is organized so that you can easily locate each font and its associated files.

Set up your MongoDB environment. If MongoDB is not already installed, download and install it from the official MongoDB website. Start the MongoDB service and access the MongoDB shell or use a GUI tool like MongoDB Compass to interact with your database. Create a new database and collection to store your font data.

Define the structure of your MongoDB document. This will typically include fields for the font name, category, variants, subsets, and file paths. For example:
```json
{
"fontName": "Roboto",
"category": "sans-serif",
"variants": ["regular", "bold"],
"subsets": ["latin", "latin-ext"],
"files": {
"regular": "/path/to/roboto-regular.ttf",
"bold": "/path/to/roboto-bold.ttf"
}
}
```
Ensure that this structure fits the metadata and files you have collected.

Use the MongoDB shell or your GUI tool to insert the font data into your collection. This can be done using the `insertOne()` method for each font. Make sure to replace placeholders with actual data from your document or spreadsheet. For example:
```shell
db.fonts.insertOne({
"fontName": "Roboto",
"category": "sans-serif",
"variants": ["regular", "bold"],
"subsets": ["latin", "latin-ext"],
"files": {
"regular": "/path/to/roboto-regular.ttf",
"bold": "/path/to/roboto-bold.ttf"
}
})
```

After inserting the data, verify the integrity and accuracy of the entries in your MongoDB collection. Use queries to check that each font's metadata and file paths are correctly stored. For example, you can run a query to list all fonts or to check specific attributes:
```shell
db.fonts.find({"fontName": "Roboto"})
```
Make any necessary adjustments to ensure that all data is correctly represented in the database.

By following these steps, you can efficiently transfer font data from Google Web Fonts to a MongoDB database without the need for third-party connectors or integrations.