Request for Help: CodeIgniter 3 to 4 Migration

I'm currently working on migrating a website from CodeIgniter 3 to CodeIgniter 4 and facing several challenges. I have very limited experience with this framework and have been using AI tools to assist me.
Current Situation:

• The website is organized into Frontend and Backend sections
  
• I've already migrated CSS, JS, and images to the public directory
  
• The homepage has animations that aren't loading properly (likely JavaScript-related)
  
• Some pages don't follow the standard MVC (Model-View-Controller) structure
  

Specific Issues:

1. I'm unsure if I've correctly placed all CSS and JavaScript files
   
2. Pages without the standard MVC structure aren't working
   
3. Homepage animations are broken
   

I would greatly appreciate any guidance on:

• Properly organizing assets in CodeIgniter 4
  
• Handling pages that don't follow the standard MVC pattern
  
• Troubleshooting the JavaScript animation issues
  

Thank you in advance for any assistance you can provide!
the structure