Battery - how to treat to expand lifetime (Optimal Charging Tips)

So I saw the following article:

…and it got me thinking about how the Fairphone 2 has been touted to last between 5-7 years thanks to its sturdiness and modular upgradeability.

Now, obviously that’s not any kind of universal guarantee for anyone given the seemingly chaotic and random nature of the universe around us. But it seems a lot of problems (like the ones described above) could be easily solved by keeping in mind some tips and tricks from experienced users.

(As opposed to another solution from the same website: backing a kickstarter for a $23-36 ‘smart charger’ that will simply stop charging the phone when it reaches 100%.)

So what sort of stories and advice do people have about making your Fairphone - or any phone - last as long as it possibly can?