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I am very new to Latex and I am getting this error:

Class scrartcl Error: undefined old font command `\bf'.
See the scrartcl class documentation for explanation.
Type H <return> for immediate help.... \maketitle

My template is never even using \bf but I still get this error. I am using the newest version of Texmaker.

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    clearly some code in your document is using \bf (it should use \bfseries but if you give no information it is hard to know what to change) or add \DeclareOldFontCommand{\bf}{\normalfont\bfseries}{\mathbf} to your preamble to define \bf – David Carlisle Jan 3 '17 at 13:35
  • Note this is unrelated to texmaker which is just the editor used for producing the tex source file. – David Carlisle Jan 3 '17 at 13:36
  • I have no idea, I only know that when I am searching for \bf there are no results. So \bf is not here. I never wanted to use latex because of such errors. It is just frustrating. – Dominik K Jan 3 '17 at 13:39
  • @DominikK Most likely it's being used in a package which is (still) using the deprecated \bf command. Can you edit into the question your preamble (from \documentclass to \begin{document}). – Joseph Wright♦ Jan 3 '17 at 13:43
  • The definition I suggest will make the error go, the use of \bf is in a definition of \maketitle in some file that you are using. – David Carlisle Jan 3 '17 at 13:43
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The error message is showing that you have a local redefinition of (some command used in) the definition of \maketitle that uses \bf.

\bf has not been defined by default since 1993 so the code you are using seems a little old.

Rather than debugging that, simpler would be to use the definition of \bf as used for example by article class

\DeclareOldFontCommand{\bf}{\normalfont\bfseries}{\mathbf}

will define \bf to work as it worked in LaTeX2.09.

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