Responding to a question John Carter gives two ways to handle Mac login issues. You can picture him smiling as he first suggests this: "Do an Internet search like this: 'mac turn off login items.' And then sift through dozens of similar answers.
"But here’s my answers:
Answer #1: Right click on the item in the Dock, select Options, deselect “Open at login.”
Answer #2: Open System Preferences -> Users & Groups -> Login Items. Select the item and then click the ‘-‘ button at the bottom." (Yes, that's the little minus sign.)