I can`t see the homepage after redirect

Selected answers from the Dumb SEO Questions Facebook & G+ community.

• 
  Long Das: It redirects the same way (301) as your "relevant pages".
  In your old website directory, put these lines in the .htaccess
  
  RewriteEngine On
  RewriteRule ^(.*)$ http://newdomain.com/$1 R=301, L
• 
  Gary Goldsack: That replaces the old domain with the new domain. That`s not what I want to do. They don`t have the same file names.
• 
  Long Das: Same file name... I don`t know what you mean. Can you describe more? Thanks.
• 
  Gary Goldsack: olddomain.com/pageone.html needs to redirect to newdomain.com/newpageone
  olddomain.com (homepage) needs to redirect to newdomain.com (homepage)
• 
  Long Das: olddomain.com/pageone.html needs to redirect to newdomain.com/newpageone
  This is not the same url
• 
  Gary Goldsack: Correct. All the new pages are different.
• 
  Long Das: Are you using wordpress?
• 
  Gary Goldsack: No. The old site is Joomla, new site is squarespace
• 
  Long Das: I guess because they`re not the same platform, so it makes the this issue. Maybe, you need to manually change them as you want. Or you may apply support ticket to the Squarespace for help. :(
• 
  Henry Obilor: If it was worpress, how would you redirects.. Curious to know
• 
  Long Das: Hi Henry Obilor: you can ttep by step follow this instruction for more information. I see it useful for your question. https://www.wpbeginner.com/.../how-to-properly-move.../
• 
  Long Das: After 2-3 weeks or more, it`s up to how big is your old website data is. The Google bot index all the content of the new one. Remember you will have something to do with Google Console.
  See what it is at https://support.google.com/webmasters/answer/9370220?hl=en
• 
  Paul Thompson: Use a 301-redirect in the old domain`s DNS zone to redirect the old domain to the new one. Then put your individual page-to-page redirects in the Squarespace site`s URL Mapping tool, specifying them as 301s.
  
  Then test :)