best options on 7z for smaller size

ddim1306

Honorable
Sep 8, 2013
4
0
10,510
I need to know which options i have to set when i am creating a 7z archive for getting a smaller size
for example i dont know when i have to choose
1.what compression method
2. solid or not
3. dictionary size

Please if you can just explain to me the basics of each option and write to me the best one for the above purpose.
thanks