None, if you don't know how to speak Spanish or don't know any Spanish, there is no problem, I would explain and teach the topics from the beginning, from the main things such as the ABCs in Spanish, greetings, introductions, the structure of the verb to be and its differences in Spanish, among others, carrying out activities and repeating these activities until it is clear.
So if you have no knowledge of Spanish, there is no problem, we would carry out grammar, vocabulary, and pronunciation activities so that you feel more confident with Spanish and continue to advance better and better in it.
The good thing about 3 Minute Spanish is that you need no prior knowledge or skills. I truly believe that anybody can learn to speak a foreign language, and I adapted my method over many years, tweaking it and improving it to make sure that it worked for anybody. Whether you’re completely new to Spanish, or you’ve tried and failed to learn it in the past, you will succeed with 3 Minute Spanish
As my course is absolutely personalized and it consists mostly of private lessons, the only essential skills somebody needs to have prior to taking the course are time, interest in learning the language and speaking a language we both understand (either English, Italian, French or Esperanto, why not?). If the student has those three things, we’d be ready to start.