New on here and to mountain biking in general. Just bought a GT All Terra Outpost Trail. It has 26" tires and 21 speed Shimano Altus gears. Don't know anything about this bike. I only paid $37.50 for it with brand new 26x2.10 Kenda K-850 tires. Just wondering if I got a good deal and if there's any quirks or anything about it that I might need to know. Thanks.

The Outpost Trail (doesn't really matter what year but All Terra put's in the the mid 94-96 model years) was an entry level bike, it's not a MTB your going to be able to go off road like a more capable higher end bike, but for fireroads/MUP's it's more than adequate.

For the price you paid, you effectively got a free bike for the cost of a pair of tires.