Use optimised charging, this will help prolong the life of the battery.
Don’t leave your MacBook Air and MacBook Pro plugged in all of the time, at least drain the battery once per week.
Avoid exposing your MacBook to extreme temperatures, extreme cold can crack the metals used in lithium battery cells.
For a more detailed look including charge cycle count, click on the Apple logo in the top-left corner of your screen followed by About This Mac then click on System Report on the Overview tab. Scroll down to Power and under Health Information you should be able to see your battery cycle count.