I have very limited experience compared to most on here, but here is my two pennies worth anyway.
On wets i have found after a few frustrating early sessions just to lift firmly into the fish as soon as the line starts to straighten or dart away.
Dries are the more problematic and it very much depends on the nature of the take. If the dry disappears out of sight without you actually seeing the fish, treat it as a wet and lift in. I am assuming this take is a "sip" from underneath and by the time the dry is out of sight the fish should be turning and either self hook or a lift will largely set the hook.
i think the hardest to hit are those where you actually see the fish break the surface to take the fly, as the temptation in the excitement is to strike. I found invariable this pulled the fly away from the fish, so i started watching my leader instead and striking when this straightened. More explosive takes lift immediately and hang on for dear life.
You won't hit them all but since i started doing the above I have converted far more takes.
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Around the steel no tortur'd worm shall twine,
No blood of living insect stain my line;
Let me, less cruel, cast feather'd hook,
With pliant rod athwart the pebbled brook,
Silent along the mazy margin stray,
And with fur-wrought fly delude the prey
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