Consider using { cmd1; cmd2; } >> file instead of individual redirects.
Problematic code:
echo foo >> file
date >> file
cat stuff >> file
Correct code:
{
echo foo
date
cat stuff
} >> file
Rationale:
Rather than adding >> something after every single line, you can simply group the relevant commands and redirect the group.
Exceptions
This is mainly a stylistic issue, and can freely be ignored.
Notice
Original content from the ShellCheck https://github.com/koalaman/shellcheck/wiki.