Define and write down the conditions under which you'll enter a position. "Buy during uptrend" isn't specific enough. Something like this is much more specific and also testable: "Buy when price breaks above the upper trendline of a triangle pattern, where the triangle was preceded by an uptrend (at least one higher swing high and higher swing low before the triangle formed) on the two-minute chart in the first two hours of the trading day."
One of the most common mistakes in stock market investing is trying to time the market. Time the market, or “market timing,” means trying to figure out the best time to get in the market, or invest. It also means the best time to get out of the market, or sell. It’s not easy to be right on both ends. It can be unsettling to experience market volatility, so that’s why it’s important to understand the difference between savings (which are more stable) and investments (which can be more volatile). It’s the time in the market that is more important, not necessarily timing the market.
You may see a number of sales charges called loads when you buy mutual funds. Some are front-end loads, but you will also see no-load, and back-end load funds. Be sure you understand whether a fund you are considering carries a sales load prior to buying it. Check out your broker's list of no-load funds, and no-transaction-fee funds if you want to avoid these extra charges.
However, it might be best to not become too much of a market "expert". Some of the most famous and successful investors of all time, such as Peter Lynch, the famed manager of the huge Fidelity Magellan fund. He suggested that looking for clues in normal life is a great way to find opportunities. Lynch used to closely follow the shopping habits of his wife to see what brands people were buying. He believed that most people working professionally on the NYSE lived in a bubble.

If you want to learn how to invest in stocks, start with a proven strategy for investing in the stock market for beginners. You'll find that long-term success starts with learning how to keep the odds in your favor and manage potential risk. The recent stock market volatility and quick shifts in market outlook offer clear examples of why that is crucial.

Buy “the basket”: Can’t decide which of the companies in a particular industry will be the long-term winner? Buy ’em all! Buying a basket of stocks takes the pressure off picking “the one.” Having a stake in all the players that pass muster in your analysis means you won’t miss out if one takes off, and you can use gains from that winner to offset any losses. This strategy will also help you identify which company is “the one” so you can double down on your position if desired.