How do I keep a hacker off my mac laptop? He

He puts notes on my laptop so I can see them, he used to talk to me until I because rather upset at him for always taking everything off my computer. He just today, I saw my daughter's 2 pictures disappear off the screen and I know he does it because I've found pictures of my daughter on his little boxes that I can sometimes open. He keeps taking the firefox and chrome off and when I can get into them there is all my information on the sites including my banking information. He used to send me notes thru on my printer. He makes copies on my printer and sends faxes using my telephone number. Had to change it. I bought an iPhone and he put on it and I used it to send him a message on it, it went thru. He thinks he's a comedian and he laughs when he puts the ????? all over my screen so I can't read it. Then, when I called him, found his phone number on gitHub and called him, recognized his voice and he hung up quickly. I called back and his ugly wife picked up the phone and smarted off to me and slammed it down. Called back again and it went to voice mail, they cut me off. Called back again and the operator came in and said it was disconnected. He calls himself 'host' and he has taken control. I have gone into the laptop and cleaned it out but he has items attached to the system/var/library so they all don't come off. I didn't let him in. I don't go surfing, I'm careful, he hates for me to screw up the network and gets angry and he takes the whole sys pref out, or the network completely out. He shuts down the computer with a 'shutdown' from Berkley CA and he made another one supposedly from Apple. Apple told me that they think he's working for Apple. I told Apple that anyone that is a thief, liar, troublemaker and on my laptops (yes, I had to get another one because I write for my hometown paper in Ohio) A shutdown is where is can push a button and my laptop will shutdown and he can block my password and I have to login back in IF my password works. He has Apple on speed dial, he has microsoft on speed dial, he has GitHub on speed dial, he has any large company on speed dial. He also thinks he's a really smart fellow. He is, however, his personality is not worth a penny that's fake..I even had a writer call me from Apple and want to be kept up with this mental person..Now, after I've answered this note, Apple will probably write to me and ban me from being on here. They did it a couple of times when I wrote about this nut. This spammer has even gotten the Apple people wondering about how he got into my laptop...

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Sometimes he won't let me in recovery mode. He puts up all kinds of stupid little notes which he just LOVES to put in front of me. He makes it as hard as he can for me NOT to get back onto my computer. I also had a bad accident coming home from Apple. Blew out 4 brand new tires, went over a couple of culverts, hills, passed cars and houses and I thought I was going to turn over many times but didn't, have a really good vehicle. I had to go towards the abutment to get away from a fellow that was looking down at his lap which I figured it was a texting IPhone.

Then I don't know how he's doing it then. I've been told that he could be my neighbor, he could be down the street, which I didn't find someone I used to work with that lived down the street. This guy is a thief too because he stole food where I worked and this guy worked too. We used to see him and a couple of his buddies walk out with OUR door in their dirty little hands. They didn't think a thing about it either. Thieves, liars and troublemakers, they are the worst of the lot. No wonder they are doing remote work...

I remember now where I picked him up. I was doing the taxes and I got onto a site and he was there. He was teasing me through printed messages. He kept it up so much that I just quit the site and went to a tax place physically.

I do this. I think he's (now THEY) is getting thru my provider. Most of his friends have the same provider that I have. It takes me awhile to actually get into my laptops because I have to change everything that he's put on. I can't change the items he adds, don't know how to. Now I have 22 devices on my laptops. I have 4 of my own so that means I have 18. I need to know how to take them off or block them. Actually, I did block them and he hacked my password and took them off. I put them back again. Thank you for responding to my question..

how do I do this, please?

I have, many times..I just got my newer laptop back from being taken apart from the insides. When I opened it, it was compromised.