First of all, if you are a newbie then I recommend you study carefully about the market before you invest. Now the market is not fully recovered, this is a good opportunity for you to buy altcoin. I advise you to invest only in valuable and potential altcoin. With $ 700 then I recommend you buy and hold long term Stellar and Cardano. They are very promising altcoin, I believe they will bring you a lot of profit.