Beginners questions please

[ivans75]

Hi guys

i am a photgrqphy beginner. I have a canon 80d with ef s 10-22mm 3.5/4.5 wide angle lens and 50 mm f1.4 lens.

i ve been getting some photography resources (tutorials) online before i found this website and my cousin who loaned me the 10-22 lens also gave me a bit of advise in regards to the light and composition trilogy, however there re still many things i dont get

For example if i use av mode and shoot the same scenery (landscape) i get better pics but when i do the same scenery with manual copying the same setting, the image somewhat looks different.

Another question is, if i use auto iso, the camera tends to choose a much higher iso setting
And i ve been told to use the lowest possible and compensate the exposure with either shutter speed or apperture depending on the occasion. Do you guys leave iso on auto or adjust accordingly with situation? Do you adjust iso last after deciding what apperture?

Also, what is the best way to take picture against sun light ? I am aiming for some dramatic view especially in the golden hours period

i have many more questions in my head but id take one baby step at a time

much appreciated once again