@Puddinandpie "I'm sure I read somewhere but I can't remember where now that the vaccines have the potential to make the immune system lazy as the body will learn to rely heavily on the vaccines, and then there's also once they start waning aswell!"
That is completely wrong. Whoever wrote this to you, or told you, was either misinformed, or trying to trick you for their own benefit.
Your body doesn't "rely on a vaccine" to fight an infection.
If you get infected with a virus, your immune system has to fight back. Fighting back takes time, and one of the first things your immune system has to do is learn to recognise the virus, so that it can destroy it.
While your immune system is leaning to recognise the virus the amount of the virus is increasing inside you, and the virus is also potentially damaging your body.
If the amount of the virus gets too much before your immune system can recognise it and properly fight back then you get sick.
Depending on how hard your immune system has to fight you might also feel sick anyway. Fighting a virus uses your body's resources. So you feel sick to stop you from doing things that would make it harder for your immune system to respond. And your body is also trying to make itself a bad place for the virus to live, which is why you might get a fever -- your body is trying to get hotter than the virus can survive.
Assuming you recover from the illness, your immune system "remembers" the virus, and if you get infected with it again your immune system doesn't have to spend time learning to recognise it, and can start fighting it immediately. Because your immune system is fighting back much faster, there's less chance that you will get sick.
It's not zero chance -- maybe you got exposed to too much of the virus and your immune system can't win before the virus makes you sick, or maybe your immune system is dealing with another infection at the same time, or one of a myriad other reasons. But your chance of not getting sick is much, much higher if your immune system doesn't have to spend time recognising the virus, and can start fighting it immediately.
Basically, it's a race against time.
The vaccine is something that your immune system can recognise and remember. So you get the vaccine, your immune system mobilises, remembers what the vaccine looks like, and maybe makes you feel like crap for a few days because although the vaccine doesn't have anything harmful in it, your immune system still thinks it has to fight.
Different vaccines look like different viruses to your immune system. The measles vaccine looks like the measles virus, the polio vaccine looks like the polio virus, and (thankfully), the Covid vaccines look enough like all the Covid variants that they still provide protection.
The last bit of the puzzle is that although your immune system remembers what the different viruses or vaccines look like, over time it can forget. That's why the effectiveness of the vaccine (or being infected) can reduce over time, and why getting a periodic booster re-teaches your immune system what the virus looks like.
For a somewhat strained analogy, imagine you get a phone call from a number you don't recognise. You answer it, talk to the person on the other end for 10 minutes, realise that they're a scammer, and you hang up.
That's the "I've not been infected / had the vaccine" before scenario. Spending time talking to the scammer is the "getting sick" equivalent.
Now imagine that after this happens you put an entry in your phonebook with that number and "Scammer" next to it. The next time you get a call from that number you'll see "Scammer" flash up and you won't bother answering. Or maybe you answer it briefly to tell them to go away, and then hang up.
Getting the vaccine is like someone else telling you "Number 123 456 7890 is a scammer, put that in your phonebook so if they call you you don't need to answer.".
Knowing it's a scammer doesn't prevent you from receiving the phone call. It just makes you realise it's a scammer much, much faster.
And for completeness, imagine that your phonebook deletes phone numbers that haven't called you in a while. So after some time, if you don't get a call from the scammer, then the number just disappears from the phonebook.
Then one day they call again, and you have to waste 10 minutes before you realise they're a scammer again and hang up.
I've simplified the above a bit, but that's the important points.
I hope, after reading that, that you see that your immune system in no way relies on the vaccine to fight the disease, only to recognise the disease much faster. And so vaccines do not make your immune system "lazy" in any way. Vaccines make your immune system better, because it can respond faster.
One last way of thinking about it; when you hear someone say "The vaccine protects you against Covid", that's a shorthand. What they're actually saying is "The vaccine teaches your immune system to recognise Covid faster, so your immune system can protect you against Covid".
More accurate, but not as snappy.
Hope that helps.