I am looking to find the strategy with which one can find BTST and STBT opportunities?
One of the most popular methods is to see the current days Leading Sector and top leading company & Laggard sector and top losing company.
Paper trade for few days before you get your hand on it completely.
You should learn from CA Nagendra Sah who explains in detail the various methods to successfully trade BTST & STBT with very high success rate. With his almost near 80% success rate making money while spending very less time looking for the stock or screening the stock is possible.
His strategy is similar to what @manoj has explained but in a step by step process and in detailed manner in which even a newbie can understand to trade BTST & STBT successfully.