I like to bet big on a few big ideas so i hold on average only 3-6 counters at any one time. I use both FA and TA and stack up all the short-term and long-term probabilities in my favor to absolutely shred my risk to the minimum (since i bet big) and maximise my upside in terms of timing, entry, and exit. Bet on the biggest, best ideas and don't waste time, energy and money on small, meaningless, risky bets. I want to take out the meat of a move, then move on to the next idea. Focus on trading well, instead of making fast money. It only takes one, black swan, greedy mistake to cause irreparable damage.
Fundamental analysis enables you to step before, or go against, the crowd, and tells you what the right price should be. Technical analysis teaches you to read, follow, and move in alignment with the crowd and see what price is trying to do.
An edge is an advantage you have in a situation. FA and TA are edges. So is being able to think clearly and rationally without stress. With proper risk management and position sizing, one avoids succumbing to fear and greed. Greed tempts a person to bet too big, and once the bet goes against them, they easily panic. Conversely, if one bets an appropriate amount (trade well instead of trying to make fast money), they will be able to objectively assess the appropriate action to take (average down/up, do nothing, or cut loss).
Fundamentals create the primary probability wave of how price moves. No bear market can happen in an economic boom, and no bull rally can erupt in a terrible stock. However, market sentiment, technical action, and a myriad of other factors contribute their own probability waves. The summation of how all of these probability waves play out in time and space determines how price moves. As such, I always focus on fundamentals first so as to know which direction price will move. Then i study the price action to see what the price is trying to do to determine whether to enter or to wait.
Don't settle for mediocrity. Acknowledge your limits, but constantly push yourself to maximise what you can do with what you have. This means only investing in the very best stocks that gives you far less risk and more upside than any 'stable blue-chip' can. This means that 90% of stocks are not worth putting your money in. The top 1% will be the home runs, the multi-baggers that will require some luck and diligence to uncover. The stock market compounds your effort, diligence and ability, so steady, small improvements can snowball into a huge difference.