I wanna see my feature image on the left site of my content

To achieve that, please try adding this custom CSS under Theme Options > CSS:
@media (min-width: 980px){
.category .entry-featured {
width: 30%;
float: left;
}
.category .entry-wrap {
float: right;
width: 65%;
}
}
But I recommend you to take a look at Ethos stack, the layout of blog page:
Hope it helps 
thanks, but can you specify me how this section is created? I also wanna create this slider

That is the Ethos Stack Post Slider. You can enable it under Theme Options > Ethos

Then you can select posts and enable it to show in the slider.

For more information, kindly refer to the link below.
Thanks
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