I got to level 5 in less than 24 hours. This has been so much fun! It is kinda addicting actually but a good kind of addicting. I know this may not be a big deal to anyone else but it is to me.
It means you are 1% on your way to get to maximum level 25 (you got 300 XP and the max level needs at least 30,000 XP). Refer to this https://www.duolingo.com/comment/2261330/XP-needed-per-level