Top 10 online busines  for free

Mail Marketing

Free tools:Mailchimp, Klaviyo, constantcontact, Salesforce pardot, hubspot

SEO

seo backlinkes :linkedin Medium, Quora, Rddit, Bizsugar

Social media marketing

facebook, instagram, twiter, pinterest

Freelancer

ZOHO, Trello, communication tools, evernote

Digital Marketing 

Buffer, Ahrefs, Yoast, canva, upwork