Download and watch some of the hotlap replays from lfsworld
Note: multiplayer replays lie ! don't copy lines or braking points from other drivers in multiplayer mode as the slight lag thats always present makes all of them inaccurate !
Make sure the replay uses the same input controller as you - no point in watching a wheel replay if you drive with mouse
- and if you use wheel, make sure that you have same pedal config - e.g. combined or seperate axis can make a big difference to driving style.
Watch the replays from different viewpoints - watch from wheels view and look at the 'mouse indicator' to see how much they are turning the wheels. Watch from the view you race in (cockpit is best IMO) to get a good feel - if you drive on the right find replays that drive on the right and vice versa. watch form chase view to see how much curb they take at apex.
Switch on pedals input to see not only when brake and gas are applied, but how heavily and how slowly they are pressed and released.
Check what speed they are going at at marker points - e.g. apex, exit, and any good marker you can find - start/finish line, a change in the road texture, a marshal in the crowd etc - ideally shortly after corner exit as exit speed is VERY important to good laps. This will give you targets to aim for, and is a better indicator than split times - because it tells you which corners you are bad/good at, not just which track sector.
e.g. if on Blackwood you are getting the same speed in back straight marker (say.. where the blue+white left curb finishes after exit of chicane ) as world record lap , but your 1st split is much lower, then you know that your chicane is good, but you are slow in either t1, or final turn of previous lap - so next few laps you check speeds after final turn exit - this way you can narrow things down and work out what to concentrate on
Go on a less busy server, and after settling in and having a few races, see if any of the faster racers are willing to spectate you and give you some tips - even with the inaccuracy of multiplayer, they can help you to spot obvious areas for improvement
The guy that said no tyre squeal is best is wrong - loud tyre squeal is bad, but a little quiet squeal means you are maximising the grip potential of the tyres !
keep steering and pedal inputs to the minimum for fast times
Most important of all: Be cool ! Be clean ! Show respect ! and HAVE FUN