Problems with obtaining a Czech visa, as well as further travel to Germany, provided that the first crossed border is Czech, should not arise. Another thing is that when you apply for a visa, you will apply for accommodation, that is, stay in the country, and if it turns out that the duration of stay in Germany will be significantly longer than in the Czech Republic, the consular staff can ask you: why, in fact, a Czech visa is issued, not German.

We recommend that you open the visa that is required. This will help to avoid trouble. At the border, you have the right to demand all supporting documents that prove the purpose of the trip and the return flight. If the visa is used for the first time, it will be necessary to prove that the purpose of the trip is the specified country that issued the visa. If this is an already open visa, you can ask for a return ticket and medical insurance.