Investing in Roblox IPO

I heard my grandpop talking about how Roblox was having its IPO.  I didn’t know what that was so I asked him and he said I could buy shares of the company.  I didn’t know what that was either but I said I wanted to do it.  So my mom got me some on Robinhood which is an app for buying stuff like that.  I bought two shares with money she gave me.  I thought I would get Robux to use in the game but then when I learned more about it I realized it means you own part of the company and that amount of money goes up and down.  We look at the charts to see what it is worth. I hope it goes up more and I can earn more money.  I might buy more shares if I get some money from my birthday or maybe Christmas.