How to echo "[]" and "/" as string

I have a question regarding entering character. So what should I do if I want to enter
" [strong] " as a string , or
“sed -i ‘s/linux/Test SED BERHASILLLLLL /’ ansible.cfg”
as a whole string in onExecute for example?
the words combined with “[]” and “/” always got detected as method and it confuses me till now.

Echo the corresponding html char code:

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