best in what way? if you're talking about risky but profitable then holding cryptocurrencies that have strong support. if you want something with minimal risk but far less return you're better off going with mutual funds.
If one want to take advantage of investments, then try to diversify your funds and invest in all different products then over the time your profits will go higher. We shouldn't keep all our funds in any single product or company, try to put them in as many as good products. I have invested in gold, real estate, shares, mutual funds and bitcoins.