I'll be using this to fill in some content that was not covered enough. Other than that, this will be just a reference for other material that will better explain system design than I can.
I would recommend starting with Grokking the System Design Interview eCourse. Worth the money and will fill in a lot of the gaps for a beginner to system design. Use the YouTube channels as supplement and Google's SRE eBook for context to some real life scenario debugging.
I recommend checking this guy's channel (Success in Tech). I would actually avoid Tushar Roy's channel, the quality of system design isn't on par. Another possible channel is Gaurav Sen.