Question: Few months back I purchased a second hand tripod.  

Later on I noticed that the head *(which holds the camera)* of the tripod doesn't move freely.  

I mean I have to apply some pressure to make it move left and right, and even when it moves left/right it jumps some fixed *x* degrees, i.e I can't make it move *x+1* degree, it moves straightaway to *x+5* degrees.

I don't know whether this is normal or not, but this is very annoying.

Is there a way that ***I*** can fix it? Perhaps by oiling at some right spots?

Answer: 
Force some talcum powder (or better yet, powdered graphite) into the friction surfaces of the head. This works like little ball bearings for the plastic-on-plastic rubbing of a cheap tripod head. Don't use oil, it just makes it worse.

I have a $25 Amazon Basics tripod, and this made a big improvement. I drilled a little hole in the panning head to force the talcum powder in, but maybe I could have just rubbed it into the cracks. It made a big improvement in the stiction and judder. The only downside is that it now smells like baby powder.
My benro has a dial on the side that if I loosen it, it also loosens the ball inside the head.