German has a reputation for difficulty that it only half deserves.
The half it does not deserve is pronunciation. German spelling is close to phonetic: learn the rules once, and a word you can read is a word you can say. There are no silent endings to trip over the way there are in French, and no tones to get wrong the way there are in Mandarin. Your accent will be bad for a while and you will be understood from the first week.
The half it does deserve is grammar, and it is concentrated almost entirely in one place.
The thing that is actually hard
Every German noun has a gender. That gender changes the article in front of it. And the article changes again depending on what job the noun is doing in the sentence.
That is why German can write the same sentence in several word orders without changing the meaning, and it is why a learner who has not internalised the articles cannot read German at speed. The information English puts in word order, German puts in three letters at the front of the noun phrase.
Everything else follows from that. The cases, the adjective endings, the relative pronouns: all of it is the same system seen from different angles. Learn it early, and German becomes fairly gentle. Defer it, and you will spend years being understood without understanding.
What this course is
A hundred words, one chapter, and three grammar guides: the articles, the four cases, and the six modal verbs. That is a deliberate size. It is enough to read simple German sentences and find out whether the language suits you, and it is honest about stopping there.
If it does suit you, our Spanish and French courses run to several thousand words each, and German will grow the same way if the demand is there.