Won't start or turnover or anything

I was just under the hood of the car today and checked the ground connection and it was good but I am now wondering if I should change the negative battery end as well?

Well when I changed the positive end it wasn't in bad condition just wasn't getting a really good connection so I'm thinking maybe that but I also had my dad look at it he thinks there might be something drawing power from it over night

Yeah but only overnight when i'm at work during the day I start it on every break and its fine but when it sits over night in the cold it doesn't start the next morning unless I put a booster to it

Ok so 2 more things to add to this I read about a couple of troubleshooting tests online one to test the battery cables which for positive should read less then 0.5 volts and negative to read less then 0.3 with a mutimeter means they are good which they read 0 for both and then I also read online that if you start your car turn the headlights on and then turn it off and start it again with the headlights still on that if they dim when starting could mean a bad solenoid which is part of the starter so i'm wondering if maybe the starter is in fact bad?

Ok so I have tested the starter it comes back as good still unsure about the solenoid in the starter but a little interesting note to add when I tested the voltage between the positive terminal and and the cable end it reads 13 almost 14 volts but when I switch it and test between the negative terminal and cable it reads 0