those quick tips in full

Try pointing your thumb out from your hand in front crawl - your hand will be flatter
Don't breathe for two strokes at least out of a tumble - you'll lose speed
Make sure you keep your head still in backstroke and only roll your shoulders
On the blocks make sure your weight is forward on your toes - not on your heels
If you slip on backstroke starts, try putting one foot slightly lower than the other
In front crawl make sure you pull all the way down to your hips - don't let the water go
Make sure you get into a good streamlined position after the start and every turn
Flexibility is crucial for swimming - keep supple with lots of stretching
In fly make sure you drive forwards not upwards - lifting too far out of the water wastes energy
When breathing in fly push your chin forwards rather than lifting your head - you will stay flatter
In Breastroke, keep your head at a 45 degree angle rather than looking forward or down
In front and back crawl, don't place your hands across your body centreline at entry
Remember practice improves, but only perfect practice makes perfect
On backstroke starts, throw your arms out horizontally around your body rather than straight back overyour head
Habits are hard to break - make sure you get into good ones
Perfect everything you do. Remember 99% right is 100% wrong
When kicking off the wall make sure your fly kicks are fast and small or you will lose streamline
Streamlining gains you metres every start and turn