Beginners often forget to quote variables, leading to word-splitting and globbing bugs ($var vs "$var"), misuse ls for parsing filenames, and neglect exit-code handling. Other pitfalls include not using set -euo pipefail, unintentionally overwriting files with > instead of >>, and trusting unvalidated user input (risking injection). Relying on for file in $(ls) is fragile; prefer while read -r or find -print0 | xargs -0. Beginners also overlook portability differences (bash vs sh) and use non-portable constructs without documentation. The cure: learn safe idioms, run shellcheck, write small reproducible tests, and ask for code reviews—people on forums love to flag subtle issues and suggest safer patterns.