More on stop loss orders, which are called The Most Important Trading Tactic in this article from The Balance. The idea of stop-losses is great. In practice, I’m less convinced.
The optimal degree of the stop-loss price is different for every investor, and sometimes may be as low as a few percent. For others the level could be as great as 30 percent, sometimes even larger. For example, some investors may set their stop-loss price at 70 cents for shares which were bought at $1. Whatever level each person chooses represents their total downside risk.
An effective strategy to protect against downside, and preserve potential gains, is to use multiple stop-loss prices. For example, you may commit to selling a portion of the shares at one price, then another part at an even lower level. Using our example once more, when the shares hit $2.85, you may have established a mental stop-loss at $2.50 for one-third of the shares, then another at $2.00 for the remaining two-thirds.