Here's what you learned in this section:
Strings are immutable sequences of bytes, not characters
len() returns bytes. Use []rune for character count
range iterates over runes, handling multi-byte characters
Raw strings with backticks preserve literal content
The strings package provides search, replace, split, and join
strings.Builder efficiently concatenates many strings
strconv converts between strings and numbers
Use strings.EqualFold for case-insensitive comparison