The answer is, just about everything. A 7.5:1 is right in the middle between slow and fast baitcasting reels.  In addition to being the most common gear ratio, it can be used for numerous fishing applications  The 7.5:1 is good with live bait, presenting worms, minnows, and leeches at just the right speed.  It’s a great ratio for bottom bouncing or dropshotting in heavy bottom cover, and it is fast enough for spinnerbaits, shallow divers, and crankbaits of all types.