My motor cycle owners manual says use engine oil of?

i have 2016 70cc ordinary honda motor bike i use it for daily work carrying around stuff you know the chores its not a sports motorbike. On the owners manual its says engine oil
SAE20W-40(API-SF/CC) well this is confusing i been find this rating on zic and shell website but did't find anything i want to know the best engine oil for my motorbike. Please recommend engine oil from shell or zic because there is a whole variety of their engine oil available where i live and also the temperatures are very extreme here in winter i goes under 10c and in summer it goes up to 45c it insane i know
Added (1). it even says you can use from 10w-30 to 20w-50

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