Accessories are where telescope money quietly disappears, and the useful ones are a short list. This page is that list in the order the purchases actually pay off, which is not the order the catalogues present them in.
First, a better low power eyepiece
The eyepieces bundled with most telescopes are the cheapest part of the package. One good wide field eyepiece at low power changes more about the experience than any other single purchase, because it makes finding things easy and makes big objects look like something.
Second, a collimation cap and a red dot finder
Both cost very little. The cap keeps a reflector performing as designed rather than slowly degrading into softness. The finder turns pointing from a chore into a reflex. Neither is glamorous and both are used every session.
Third, comfort
A observing chair with an adjustable height, a red torch that does not destroy your dark adaptation, and something to keep dew off the optics. These are what decide whether a session lasts twenty minutes or two hours, and they are almost never on a beginner's list.
What about the bundled accessory kits
A telescope kit bundling six eyepieces, filters and a barlow is usually a set of mediocre components at a low total price. They are not worthless, and one good eyepiece will outperform the whole box. If the kit comes free with the instrument, keep it and upgrade gradually rather than replacing everything at once.
Questions people ask about telescope
What accessories do I need for a telescope?
A decent low power eyepiece, a collimation cap if it is a reflector, a finder you get on with, a red torch and something to sit on.
Are telescope accessory kits worth it?
As a cheap way to try several focal lengths, yes. As a substitute for one good eyepiece, no.
What is a telescope kit?
Usually a bundle of eyepieces, filters and a barlow sold together. Convenient, and generally made of budget components.