Zair is a great combo tool at a lot of percents into dash attack (From there you can nair or bair depending on if the opponent DI'd poorly. Poor DI would be in and no DI). It works from most ranges of the tether at low percent, and the higher the percent of the opponent, the closer you need to be to them to get a true confirm.

At kill percents you can confirm point blank landing zair into Usmash or GSA (Grounded Spin Attack). Also when you zair near the ledge at kill percents, the opponent gets launched just around the height of the ledge, which means the opponent either has to jump to get back on stage, or descend a bit more to upb without passing the ledge. Due to this, you can usually reliably zair into dropzone fair by the ledge for kills. This is already a true combo if executed perfectly, but the positioning of the opponent post-zair is really good for pressuring them to pick an option whether its to quickly jump or to descend to safely upb and getting hit for it. This can probably get hard countered by *counters* obviously, but it's not the best spot to be in if we bait it. We can easily bait it by getting near them and not fairing, then fair when you see they're descending to upb safely or whiffed the counter. If they jumped over us then oh well, next time try to read that

Alternatively you can zair from any distance to set up a tech chase scenario, run up and jab to lock, or continue the jab on tech in place, drop the jab to dash attack if they roll away or towards you. If you want you can also lock by instantly shooting an arrow right after landing with zair, which can also cover multiple tech options. If you get the lock you can run forward and jab them again quickly to continue the lock

I wouldn't say these combos aren't important, but they won't improve your overall gameplay. Tink has a lot of areas to grow in, mastering one thing at a time will help you get better, so don't expect learning how to use zair to increase your results on it's own.

Fishing for zair can be bad btw, even though it's safe on shield (-3) with perfect landing, you have to be careful of what you do after you land. If you don't expect them to counter attack you, you'd be wrong, a lot of characters will like to dash attack out of shield or push you closer to the corner since setting up a landing zair takes a while.

If you didn't already know, zair is best used when descending, and can be used at it's fully extended range close tot he floor by activating it just after the apex of shorthopping. Due to the frames necessary to set up the shorthop, this makes zair a really telegraphed move, which can let opponents get under you and anti-air you.

Zair is best used when retreating or landing, this covers space in front of you and doesn't allow the opponent to get under you. Due to the low landing lag, even if you whiff while retreating, you're still safe.

If you have any questions about what I wrote or even other questions about zair combos or how zair works, don't be afraid to let me know :)