For you to be new, if you can invest 7k dollars. I will suggest you Bitcoin for investment. Because if you invest in Bitcoin you will get good profit but you have to be patient till bull run or halving.
It is true that Bitcoin is a safe investment, it is a good decision to choose Bitcoin. But I think it is no problem to invest in top altcoins, too. Top altcoins like Ethereum or Binance is a safe option as well. In the next bullrun, these altcoins will even increase more significantly than Bitcoin. We know that altcoins are more volatile than Bitcoin. So, it will be very unfortunate to miss the chance to get profits with altcoins. In my opinion, $2k is enough to invest in ETH or BNB.
If you want to make daily $30 profit, you have to follow two ways to earn $30 daily. First of all, you have to be an expert in trading and invest in altcoins and do short trades. Although the risk in these is very high.
Yes, trading has a high risk. And it is not easy to be an expert in trading, it requires many years. However, it is no problem to try trading although we are not an expert. But we must always use small money only, focus on learn how to trade properly. Earning $30 with the capital about $7k will be easy if we already know how to trade properly.