RYA Dinghy Level 2 Basic Skills is the course where you stop needing an instructor in the boat with you. You build on Level 1 Start Sailing until you can rig, launch and sail a dinghy on all points of sail in light winds, tacking and gybing with control. It is still recreational sailing, not racing, but your hands start to know what to do without constant prompting.
Most centres run roughly two days or sixteen hours on the water. You will practise capsize recovery and man overboard recovery, learn essential rules of the road, and develop weather awareness so you know when to stay ashore. Stronger wind days are useful training; your instructor may reef early rather than scare you. That is the point.
When you pass, the RYA standard says you are able to sail a dinghy in light winds without an instructor on board. That is a meaningful step: club open sailing, hire boats at some venues, and progression toward Level 3 Better Sailing all become realistic. Under-16s may prefer the Youth Sailing Scheme, but adults commonly take Level 2 straight after Level 1.