I am a first year Maths PhD student in Singapore. As I am going to give my first talk at a Mathematics conference soon, I look for some tips on how to give a good talk. While googling, I come across Terrence Tao's blog post entitled 'talks are not the same as paper'. In the post, he stated in third paragraph that,
Instead, a talk should complement a paper by providing a high-level and more informal overview of the same material, especially for the more standard or routine components of the argument; this allows one to channel more of the audience’s attention onto the most interesting or important components, which can be described in more detail.
I have difficulty understanding the meaning of 'high-level'.