Create folder called old_files inside of the personal folder and copy the letter_of_engagement.txt to the old_files folder.

To create a folder called old_files inside of the personal folder and copy the letter_of_engagement.txt to the old_files folder, you can use the following commands:

1. Open the terminal and navigate to the personal folder using the cd command:

```
cd ~/personal
```

2. Create the old_files folder using the mkdir command:

```
mkdir old_files
```

3. Copy the letter_of_engagement.txt file to the old_files folder using the cp command:

```
cp letter_of_engagement.txt old_files/
```

This will create a copy of the letter_of_engagement.txt file in the old_files folder.

I suspect that the "personal" folder is just ~

Otherwise, you have no idea where to put it.