Buying something at good value is a good approach, however it is another approach to know when to enter and exit the market, enter Wyckoff logic. If You 'know nothing' of Wyckoff logic is a good time to start.
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"If you cannot make money out of the leading active issues, you are not going to make money out of the stock market as a whole." ~ Jesse Livermore Trading Rule
"Successful speculation requires staying on top of changes in industries and companies that either create new industries or improve on existing industries. The majority of your profits will come from these two ... The shrewdest traders throughout history all adapted the skill of reactionary change, as the market constantly presents new and different opportunities." ~ Bernard Baruch
"A market is the combined behavior of thousands of people responding to information, misinformation and whim." ~ Kenneth Chang
"If you have trouble imagining a 20% loss in the stock market, you shouldn't be in stocks." ~ John (Jack) Bogle
"If a speculator is correct half of the time, he is hitting a good average. Even being right 3 or 4 times out of 10 should yield a person a fortune if he has the sense to cut his losses quickly on the ventures where he is wrong." ~ Bernard Baruch