Well I want to know more about why the driver of a car that drives on the left hand side of the road sits on the right hand side of the car nearest the middle of the road as I don’t drive a car is there a reason? Also some advantage to it and things like this?
It’s simple: You can better judge where an oncoming car is relative to your own when you are closer to it, that is, nearer the center of the road. If the driver sat on the far side there would be poorer visibility for oncoming traffic.
As a driver, you use the reference points you can see. You can easily see the stripes on the road from the driver’s position. It’s harder to see reference points that would be on the passenger side, because the bodywork of the car is in the way of your sight lines.
When making a right hand turn it’s easier to see oncoming through traffic which is partially hidden behind oncoming cars also turning in front of you, to their right.
It’s more important to maintain clearance from traffic coming in the opposite direction, since
(a) the relative speed of approaching traffic is the combined speed of both vehicles; and
(b) two moving vehicles with people on board are wiped out rather than one.
If you misjudge the side away from oncoming traffic (i.e. right in the U.S.), you’re usually colliding with something stationary, so the relative speed is only the speed of your own vehicle; and only one vehicle with people on board is likely to be involved. It will often be far less serious, hitting a kerb or taking off the mirror of a parked car or something.
nm
We didn’t always have 11-foot travel lanes on all roads, and judging clearance with oncoming vehicles was usually felt more important than the danger of sliding off the road. (One reason for differing rules on leftside or rightside driving is the different types of vehicles being used in different parts of the world when a rule became necessary).
In some countries, for a variety of reasons, curbline controls are more typical. One that comes to mind is Myanmar, which changed to right-side driving in 1970, but virtually every vehicle is right-hand-drive, generally second-hand imports from Japan. Just because it’s common doesn’t mean it’s optimal, though, and I noticed in 2018 that all Yangon’s new Chinese-built transit buses had much more convenient curbside doors—meaning the driver sat on the left.
I got reacquainted with how much easier it is to gauge your closeness on the side your seat is on when I visited Scotland and was issued a right-side driver-seat car for driving on the left side of the road.
It took several days of horrified panicky driving before something clicked in my head and let me “map” my intuition for the far side of the vehicle so that it would work for the left side of the car. Prior to that, I could tell quite confidently where MY side of the car was, but it felt like the far side (the left side) was 30 yards over, I was afraid I was going to hit every bridge buttress, tree, guard railing, etc. It really takes awhile to develop that “sense” of something when you can’t directly see it.
As a part time mail carrier in my college days I was sometimes given a mail truck to collect street side mailbox loads. Driving on the right side of the road from what felt like the passenger seat took some effort to get used to.
I did just fine with driving in my lane when going forward.
Turning right was pretty easy.
Turning left at a multi-lane 4 way stoplight was scary. Not just for me but for others in the intersection.
Almost took out a streetlight in Frontenac Mo and scared a few passengers in Kirkwood.
Less serious to the driver, sure. Never mind this bicyclist…!
(Really, I absolutely hate to be passed by those timber-hauling trucks on my way to work! Sure, the drivers are very experienced, and so far I’ve survived. But sometimes they pass me with a clearance of only about a foot or so, in 50 mph!) 
I have driven a left hand drive car in England–briefly. It’s no fun. I also drove a right hand drive there for about 3 weeks of touring. It took me about 5 minutes to adjust to that. Harder was learning to adjust to crossing streets as a pedestrian. I think our instincts go back further and are more deeply entrenched.
^^When I was stationed in Australia, I was able to bring my left-hand drive vehicle with me. It wasn’t too bad, unless I had to pass a vehicle on a two-lane road. I’d have to swing way out to see if the coast was clear. Not fun.
A simple periscope would take care of that problem, though. Or a camera, if you prefer hi-tech. 
Similar here. When I moved to the UK I brought my American car with me. I also had an early left hand drive Smart for a while. Did several road trips in it with my girlfriend navigating. Other drivers would freak out a bit when they saw what they expected to be the driver holding a big map in front of them. I’ve also driven a right hand drive car in France so I’ve covered all 4 possilble combination.
Interesting fact about bicycles - In countries where you drive/ride on the right the lever for the rear brake is on the right. It’s on the left in countries where you drive/ride on the left. I’ll leave it as an exercise for the reader to work out why.
Re: being able to see better, it’s one reason why people find parallel parking to be tricky. Practicing on a one-way road with parallel parking on the “wrong” side of the road can help people get the mechanics down. YMMV
Interesting, sensible, and completely unknown to me!
It’s not really a consistent standard. I believe the EU adopted the standard based on some confused notion of the way you should brake when hand signaling to move across traffic, when only one hand is not the bars so only one brake is accessible. If that’s the reasoning, it implies that they think it’s the rear brake that’s more important, which is wrong.
I’d always advise people to set up with the front brake on their dominant side, since the front brake is far more effective, and it’s better to have it on the side with better fine motor control for modulation. But whatever you choose, better to stick to it for life once you’ve established the muscle memory, I’d never change if I moved to another country.
I’ve also heard that it’s a signalling thing when moving across traffic, which does make sense if it’s true as you don’t want to be snatching a fist full of front brake when you’ve only got one hand on the bars or there’s a high chance the bars will twist and you’ll be getting a stern lesson in high-side wipeouts from Professor Faceplant. That said, I’d want my front brake operated by my dominant hand no matter what country I’m in; luckily I’m right-handed and we drive on the left over here, so that’s worked out well for me.
I’ve also driven the four quadrants, and while naturally the easiest one for me is the one I’m used to (right-hooker driven on the left), the second easiest is left-hooker driven on the right. Third and fourth places are a tie.
On the motorway/interstate/autobahn etc. I’ve noticed that if I’m in the outside lane then I’m about the only driver on the road who’ll bias their position to be closer to the crash barrier than the next lane of traffic, my reasoning being that the crash barrier is less likely to drift into me than the vehicles in the adjacent lane. Sometimes, if I’m bored, I’ll play a game where I drive on the cats’ eyes without drifting onto the rumble strip an inch away (or, indeed, into the crash barrier). It’s great practice for getting a feel of where your offside wheels are tracking, and it usually ensures that the vehicle behind me backs off to a safe distance instead of sitting right up my chuff.
From what a lawyer once told me, saying you were following the centerline is always the correct response when pulled over for drunk driving, it’s the legal definition of driving correctly in just about every state. Any other response leaves you open for being accused of swaying between lines or driving erratically.
I would also point out that in the days before turn signals were omnipresent, people would reach out the window with their arm to signal their intentions. If the opposing drivers are on opposite sides of the road, it is much harder to see.