I've read a lot of stuff about headers and footers now but I just can't get rid of my problem. I want to have a header which is actually a table. Please look at the PDF which displays how it should look like and tell me how to do this in LaTeX.
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The option for the helvet font package is wrong. See the package manual for details. You should get a corresponding error message in the log file (*.log).
The length \headheight is too small in this case and needs to be adjusted. There is a corresponding warning in the log file along with a suggestion for adjustment.
The header needs to be included into the type area in order to make it visible in the output.
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And: Currently, Packt sells ebooks for $4.99 each if you buy 5 of their over 1000 ebooks. If you choose only a single one, $9.99. How about combining 3 LaTeX books with Python, gnuplot, mathplotlib, Matlab, ChatGPT or other AI books? Epub and PDF. Bundle (3 books, add more for higher discount): https://packt.link/MDH5p