[mothered]

but when i do gaming i plug charger and play games for 4-5 hr and sp question is keepking 100% battery will damage it ?

Not at all.

My laptops are always on charge, and the health of the battery Is not affected.

if battery is around 60% and i plug charger and start playing games mean laptop is using Ac power or until battery fully get charged.

and one more question about battery cycle as i do gaming so keep laptop at 100% while will reduce cycle ? at normal work i never charge my laptop much just make 90%.

When plugged In, your laptop Is using AC power and at the same time, the battery Is (obviously) charging.

Although It's good practice to allow the battery to discharge every so often, as said, having It on charge will not affect Its health.