Question about nutrients

I'm a first time grower. I'm going to be growing auto flowers.
I don't want to worry to much about pH.. is it good if i use only blood meal for vegging and flowering?
Or is there any nutrients that don't increase/decrease pH levels?

no it is not good if you only use blood meal. look at the NPK value, it is 12-0-0.... you need some phosphorous and potassium, plus trace nutes and minerals.