Start by cloning the GitHub repository that contains the data you wish to move. Use the `git clone` command followed by the repository URL in your terminal or command prompt. This will download the repository content to your local machine.

```bash
git clone https://github.com/username/repository.git
```

Navigate to the cloned repository directory and identify the data files you need. These files could be in formats like CSV, JSON, or other structured data formats. Make sure to gather all necessary files into a single local directory for easy access.

Before importing the data into Teradata Vantage, ensure that the files are properly formatted. Clean the data by removing any unnecessary headers or footers, and ensure consistent delimiters and data types. This step is crucial to avoid errors during the import process.

Ensure that you have access to a Teradata Vantage environment. Install any required client tools such as Teradata SQL Assistant or BTEQ (Basic Teradata Query) on your local machine. These tools will facilitate the data import process.

Log into your Teradata Vantage environment and create tables that correspond to the structure of your data files. Use SQL `CREATE TABLE` statements to define the schema, data types, and any necessary constraints. Ensure that the table structure matches the data files to prevent import errors.

```sql
CREATE TABLE example_table (
column1 INT,
column2 VARCHAR(255),
...
);
```

Use Teradata's native utilities like FastLoad or BTEQ to load data into the target tables. FastLoad is efficient for initial data loading into empty tables, while BTEQ can handle smaller or incremental loads. Write a script to specify the data file path, target table, and necessary load commands.

FastLoad Example:
```plaintext
LOGON /,;
DATABASE ;
BEGIN LOADING ;
DEFINE
column1 (INTEGER),
column2 (VARCHAR(255))
FILE=;
INSERT INTO VALUES (:column1, :column2);
END LOADING;
LOGOFF;
```

After loading the data, perform data integrity checks to ensure successful import. Run SQL queries to count rows, check for NULL values, and compare the data against original files to validate accuracy. Ensure that all data has been transferred correctly and is ready for use.

```sql
SELECT COUNT() FROM example_table;
SELECT FROM example_table WHERE column1 IS NULL OR column2 IS NULL;
```

By following these steps, you can effectively move data from GitHub to Teradata Vantage using native tools and processes, ensuring a streamlined and controlled data transfer without relying on third-party connectors or integrations.