You have used the correct word - Twitter stock (along with quite a few others) is more like gambling than investing.  You are trying to catch the stock at a specific price hoping it is simply cheap and likely to go back up.  That could happen - or it could continue down.  Its not total luck as you have some reasons to believe the stock has some intrinsic value based on its earnings or potential for earnings in the future.  The issue is whether the market will recognize that value at some specific price around your entry point and then go back up to 80 or more.  That doesn't always happen - and you may or may not be privy to all the data you need to make an informed choice.  But I can't fault you for not understanding that buying a stock like Twitter as it bounces around is pretty much gambling compared to buying more traditional companies with a long track record and a dividend at a reasonable price.

I have taken a flyer a time or two on a stock like Twitter - but I made a lot more money buying GE, WFC or O at a good price and collecting the dividends.  Kinda boring - but profitable