QUES: Lag means an interval between events

correct the punctuation.

CORRECTED: "Lag" means an interval between events.

QUES: Although this video already has almost a couple of months for many readers will be new

correct the punctuation.

CORRECTED: Although this video already has almost a couple of months, for many readers will be new.

QUES: The tiles here has the measures 59 x 59 cm

correct the punctuation.

CORRECTED:
The tiles here has the measures 59 x 59 cm.