HELP! interview! where to start with private debt secondaries, debt cm, etc

hi all,

usually in the ib/be/er space but somehow got first round for a rotational program in private debt secondaries, infra, debt capital markets, and pe. i literally know nothing about the yield leveraged loan markets or debt or stuff like that and my interview is in one week. 

where did you get started when learning this stuff? i feel like for ib its simple - u start with the biws guides and go from there. Is there any equivalent guides i could rip in the next week to get me caught up? 

thanks, any help and resources are appreciated