I want to use Octobercms for my laravel project. The main question is that can I use Octobercms for specific parts of my website? I mean for example single blog pages
The best way is to use sub-domain method.
Many organisations are using this method
https://mainstite.com <- pointing to main site
https://blog.mainsite.com <- pointing to blog [ Just redirect user to blog sub-domain from main site ]
This will give you more advantage and flexibility you can use 2 separate folders
As well you can have single db or multiple db dedicated to blog only [october cms only] (so maintaining blog can be easy with dedicated blog db)
As from your main site you can access blog data from blog database also you can insert update and delete blogs as laravel can access multiple db at once.
You can share session between sub domains as well [ plus point ].
If you have any further question please comment.