Best system design course-2024

What is best system design course available? Could you please list top 3 in order with best as 1. Also mention what type of candidates are best suited for each course.

I’m currently going through interview ready- Gaurav Sen. And find it hard to follow since I have almost never done system design. Hence I find it ok-ok , are there any better ones out there? I know grokking is one more. Please provide suggestions with course name and best suited for what professionals(eg , beginner with no exposure to system design , 5 yoe with some exposure to system design , advanced with high exposure system design)