Touch your .htaccess file
Htaccess file can secure or server from hackers and as well can also help you in SEL
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No, its not necessary but it will be better can have good impact if there will be htaccess file
Yes, htaccess file can help you in saving from many vulnerabilities(Directory traversal etc) or even can help in exploits. Just to be sure that your website must not be open for vulnerabilities(SQLi, XSS etc).