Do a toilet leak test. If the flapper needs replacing, you can get one at Home Depot for around $5. If you need to replace the fill valve, you can probably get one from Home Depot for less than $20.

Thank you! Will do that. Would either of these issues be causing possible damage to the floor or anything ?

"Would either of these issues be causing possible damage to the floor or anything ?"

Nope.

Dripping noise from the inside: Maybe due to condensation?

Damage to the floor: is there water on the floor?

It sounds like a toilet flap failing to me.....me, who has three 1955 kohler toilets in this house ;0) Even I can change a toilet flap. Take the lid off the tank and look for a number inside tank - the model number of your toilet. Buy the appropriate flapper piece (not the cheapest offered) that relates to your number. Plenty of You Tube videos showing how to change rather than wait on your plumber to come for something else (as I did for years). I find if the leak becomes strong enough, the toilet will do a partial flush on its own when the level in the tank becomes too low - usually taking place in the middle of the night in the master and a little disconcerting when no one in the house is up ;0)

Thank you everyone! maybe we can try fixing ourselves. Also to answer the other questions there is no water around the floor.

Close the valve that supplies water to the toilet. Mark the level of the water in the tank. Check it again the next day and see if the water level went down. If it did then replace the flapper.