I repair Macs. Just use basic lithium battery practices:

• mostly keep charge between 30-80%
• charge fully if you are about to use
• long term storage with a 70% charge
• don’t run down to empty if you can help it
• don’t leave plugged in all the time
• avoid prolonged temperature extremes
• avoid shitty chargers, Apple chargers are expensive but generally worth it

Beware of add-ons that access hardware, for various reasons.

Apple batteries are rated for around 1000 cycles, or around 5 years of average use. Follow the above advice and you might eke out 1500 or so.