Recommendation for online System Design courses

Can anyone recommend a good online course for System Design, specifically for interviews and intermediate level? I’ve come across two options: ‘Grokking the System Design Interview’ on designgurus.io (https://www.designgurus.io/course/grokking-the-system-design-interview) and ‘Grokking Modern System Design Interview for Engineers & Managers’ on educative.io (https://www.educative.io/courses/grokking-modern-system-design-interview-for-engineers-managers). Has anyone taken either of these courses and can provide feedback on which one is better? Additionally, are there any other structured online courses for System Design that you would recommend?