Needed

So I had started prep for hld system design. My idea was to get a rough roadmap from Udemy so I purchased shreyash jain course to get roadmap. Then recently saw Hello interview video.they were quite straightforward and easy to understand. I saw there are 22 basic topics on design gurus - system design fundamental. So what would be the recommendation from other people .. where to start .. Personally I feel I should cover those 22 basic topis from design gurus (most of them i would have already idea of but just in case ) like few topic were like bloom filters , quorum , heartbeat , leader. And follower etc. Before jumping into design dropbox , uber , zomato etc etc Thanks in advance