The stock market can be an emotional roller coaster, and it's important to know when to take gains or losses and when to re-enter. Re-entry is a good idea when the price exceeds the maximum of the breakout or the low of the break, as this indicates that the underlying trend can resume. Professional traders often have advanced knowledge and experience in finance, but it's possible to make a career out of stock trading with the right technology and high stock market volumes. Before investing, it's important to read the risk disclosure document prescribed by the stock exchanges.
When it comes to individual stocks, it's best to hold on to them for a long time unless you have enough wealth to take risks. Unless you have enough wealth to take risks, it's not advisable to make trading a profession by quitting your job.