A famous saying is that risk and return go hand in hand. The more risk you take the more return you wish to obtain.
Risk can be measured in various ways, on a portfolio level and an instrument level. It all depends on you as an investor to decide how much risk you want to take.
An individual stock can be risky when that one stock quotes for 90% of your portfolio but if that one stock is only 3% of your portfolio the risk is much lower as the concentration of that stock is lower.