I have been building circuits for a long time and may have picked up some ideas that may be new to more recent builders. There is nothing very hard or astonishing about the tips but they have helped me and may help you too. In my mind a tip is not an electronics project ( but occasionally may involve putting together a mini-project ) or full directions on say "how to solder". A tip is more a little trick in technique or approach. All of the following should fit this definition.
When you are building, and particularly prototyping you tend to have a lot of parts, often ones that look alike, hanging around. Put them down and who knows what value they are. Good old Heathkit ( RIP http://en.wikipedia.org/wiki/Heathkit ) had a nice solution, insert the leads in corrugated cardboard and identify the part by writing on the cardboard. Pictures will stand in for the next 1000 words I might otherwise write.