Is RTX 3060 good for 1080p gaming?

No. A 3060 Ti is roughly comparable to a 1080 Ti, which a few years ago was practically the only GPU capable of 1080p gaming at max graphics and 144+ fps. Nowadays games are even more demanding, so that role has been assumed by the 3080. A 3060 Ti is still very capable but don’t expect 144fps at max graphics.