My most common EditorConfig configuration.

.editorconfig

# https://editorconfig.org
root = true

[*]
charset = utf-8
end_of_line = lf
indent_size = 2
indent_style = space
insert_final_newline = true
max_line_length = 120
trim_trailing_whitespace = true

[{Makefile,go.mod,go.sum,*.go,.gitmodules}]
indent_style = tab
indent_size = 4

[*.md]
trim_trailing_whitespace = false

[*.nix]
indent_size = 1

[COMMIT_EDITMSG]
max_line_length = 0

[Dockerfile]
indent_size = 4