How can I use a batch file to write to a text file?

You can use echo, and redirect the output to a text file (see notes below):

rem Saved in D:\Temp\WriteText.bat
@echo off
echo This is a test> test.txt
echo 123>> test.txt
echo 245.67>> test.txt

Output:

D:\Temp>WriteText

D:\Temp>type test.txt
This is a test
123
245.67

D:\Temp>

Notes:

@echo off turns off printing of each command to the console
Unless you give it a specific path name, redirection with > or >> will write to the current directory (the directory the code is being run in).
The echo This is a test > test.txt uses one > to overwrite any file that already exists with new content.
The remaining echo statements use two >> characters to append to the text file (add to), instead of overwriting it.
The type test.txt simply types the file output to the command window.

It's easier to use only one code block, then you only need one redirection.

(
  echo Line1
  echo Line2
  ...
  echo Last Line
) > filename.txt

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