Question

what are orbits or shells of an atom

Answer 1

there are 7 main orbits K L M N O P Q.
and s p d f are the subshells in each main orbit

Answer 2

An electron shell[1] is the outside part of an atom around the atomic nucleus. It is a group of atomic orbitals with the same value of the principal quantum number n.

Electron shells have one or more electron subshells, or sublevels. These sublevels have two or more orbitals with the same angular momentum quantum number l. Electron shells make up the electron configuration of an atom. The number of electrons that can be in a shell is equal to {\displaystyle 2n^{2}}

The name for electron shells comes from the Bohr model, in which groups of electrons were believed to go around the nucleus at certain distances, so that their orbits formed "shells

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