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The main element that you need to regularly lubricate on a bike is the chain. A few drops can also keep the cables running freely. The final spots to lubricate on a bike are the pivot points of derailer and brake mechanisms, the pivot points of brake levers and the jockey wheels of the rear derailer.
Watch the operation of the mechanism to identify the pivot points to see where you need to lubricate on the bike part.
Use a small brush or the tube nozzle of a spray lube to apply a drop of lube to each pivot point on the bike part.
Lean the bike to the left against a wall. Turn the pedals backwards and observe the line where the jockey wheels rotate. Use a small brush or the tube nozzle of a spray can to apply a few drops of lubricant along the line. Turn the pedals backwards to draw the liquid into the bearing.