Knowing German can give you a competitive edge with employers and even boost your salary prospects.
Wo mein geld?
This article seems to be targeted at brits but nevertheless, learning languages is good for many reasons. It's also fun as long as it's not something that happens under pressure.
But the "mein" is there and I wouldn't call it a pronoun in this case. If it's used before a noun like in "mein Geld" then it's just a possessive determiner.
There are several different types of pronouns. What you are most likely thinking of is called a personal pronoun, ie. I, me, you, she etc. However "mein" is also a pronoun, it's just not a personal pronoun, but a possessive pronoun. https://de.wikipedia.org/wiki/Pronomen#Untertypen In real life that kind of knowledge is mostly irrelevant, but its quite neat to have if you want to compare different languages and describe how they work.
Ja, kenne ich, traditionell wird das so genannt, aber ich bin der Meinung, dass das veraltet und verwirrend ist, ein Pronomen ersetzt ein Nomen, ein Possesivbegleiter fungiert eher als Artikel und ersetzt nichts.
In der modernen Linguistik wird Possessivpronomen auch in einem engeren Sinne verwendet und bezeichnet dann nur Wörter wie seines (in: das ist seines), aber nicht Wörter wie sein (in: sein Haus). Letztere werden dann Possessivartikel (auch: Possessivbegleiter oder Possessivdeterminanten, Possessivdeterminative) genannt.
Determiners are a more general class of words that include for example articles. Mein is not acting as a pronoun in the example sentence but more like an article.