Terminal automatically opens conda
It's default behaviour and it is not really problematic. If you deactivate it, the terminal will see default python installation, 2.7. That is troubling if you're using conda for python > 2.7.

If you're troubled by the (base) appearing in the prompt, Run:

open ~/.bash_profile


and add this line at the end

conda deactivate



How do I remove the source (base) from my terminal? 
How to get rid of (base) inside terminal app in 10.14.6?