In reply to Stuck On a Wall:
Take a look at
https://www.ukclimbing.com/articles/page.php?id=33
Basically an "onsight" climb is one you've walked up to without any prior knowledge and climbed to the top with no falls or resting on the rope.
Worked grade is the best grade climb you have got up (without falls or rests on the ascent) after having practised the route as much as you need first.
Sport climbing doesn't really have anything to do with competitive sport, it just means climbing routes that have bolts fixed to the rock for protection instead of using "traditional" (trad) gear that you place yourself during the ascent.
"Aid" climbing is largely for Americans and other foreigners who like to cheat by pulling themselves up on their placed gear, rather than just climbing the rock
Via Ferrata is more like scrambling but using preplaced permanent safety ropes, wires and ladders.
Post edited at 19:49