Ehsaan is the highest level of emaan. There is ehsaaan with Allah where when you pray you pray as if He sees you, or as you see him.
What is a simple act of ehsaan that one can do all the time, ?
Salaam is a dua, if you do it first with a fellow muslim then you have gained the level of ehsaan by being first to offer the dua to him or her!
Tafseer by Dr. Farhat Hashmi (alhudapk.com)
and here is another beautiful example of ehsaan done first……
and the sunnah of the dua salaam o alaikum