What are the best Electronics Soldering Techniques?
I'm going to second and expand on Jason S's answer.


Clean and tin the iron
(rosin) flux the joint to be soldered
with your third hand, touch the iron to the part to be soldered, and simultaneously, touch the solder to the part - not to the iron.
Hold until you see the solder "flow" and fill the joint/through hole/twisted wire/etc
pull the iron away quickly


You'll know when it's good if you can still see the parts of the joint, and it's shiny. As in, if you still can see the two wire twisting together.  You don't want to make a super-full 'ball' of solder, since then no one else can, by inspection, see that it's a good solder joint.  

Worst case is if you get a ball of solder where the joint is with a dull sheen.  That's a cold solder joint and needs to be redone.