Asking for some study material to build good submission

Hello !

Actually I am new to this , and with a background in ML , yet , in last compitition I have tried a lot but I was unable to get reasonable results , I don't really know how the good quality submission look like , or how it should be constructed etc . I understand this is not allowed , but as a beginner , I really wish to learn and have some good material over it , can someone please suggest me some resources where I can have idea of how I can build good submissions ?

Thanks a bunch in advance !