Etiquette has an image problem. The word calls up stiffness, forks in the wrong order, a set of rules designed to catch people out. That is not what it is. Etiquette, at its root, is simply consideration made visible. It is the set of small, deliberate acts that tell another person they matter to you. Nothing more, and nothing less.
Most of these practices were once passed down at a kitchen table. If they were not passed to you, that is no failing of yours. They are easily learned, and they are worth keeping. Here are the ones that still matter.
The practices worth keeping
The handwritten note. An email thanks. A note honors. It costs a stamp and five minutes, and it is remembered for years. Keep a small stack of cards in a drawer so there is never a reason not to.
The prompt reply. When you are invited, answer. Yes or no, but answer, and soon. An unanswered invitation leaves a host counting chairs and wondering. Replying quickly is one of the kindest small things a person can do.
The introduction. When two people you know have not met, introduce them, and give each a sentence about the other so they have somewhere to begin. To leave people standing unnamed is a small unkindness that is easy to avoid.
Being on time. Punctuality is a way of saying your time is as valuable as mine. Arrive when you said you would. If you cannot, say so before the hour, not after.
The phone, away. At the table, in a conversation, the phone face-down or in a pocket is a gift of full attention. It is the rarest courtesy now, and the most felt.
How to write a thank-you note
It need not be long. Four sentences will do. Name the specific thing. Say what it meant. Add a personal line. Close warmly. For example:
Dear Anne, thank you for the afternoon and the extraordinary lemon cake.
It was exactly the unhurried Sunday I needed.
That is the whole art of it. Specific, warm, brief, and sent within the week.
Before you buy anything
You do not need fine stationery to write a good note. Any clean card and a pen you like will do, and a sincere line on plain paper outshines a formal card left blank. Begin with what is in the drawer.
When you are ready to keep proper correspondence cards on hand, buy a small box of good ones and a pen that feels right in the hand. Kept in a drawer, they make the practice effortless, which is the whole point.
The edit
The few things that make the practice easy to keep.