Here's a link to Duolingo's official page about what Lingots are. Read here.
WELL DONE!!! You have a 100 day streak XD Nice Job!!!
Thanks! I just finally got it today. Read my profile description.
Haha. How long have you been on Duolingo?
You get 1 lingot for a 10 day streak, 2 for 20, 3 for 30...etc etc. You also get them for doing lessons. Some people do XP Contests. The prizes are normally lingots.
You get lingots when you complete a whole topic. Usually you get two for each lessons but they vary. Some topics may have 10 lessons some may have 2. :)
people can also give you lingots
Tell a sad story about how you have to leave town and you need lingots to preserve your streak. Of course it helps if you have a streak to preserve.
You get lingots for leveling up, finishing a lesson, and you can receive them as gifts.