In this aticle, we will see how to host domain registered in one service providers (for example, IONOS) to another service provider (eg. Bluehost).
Adding domain in your bluehost hosting:
Firstly, Go to your bluehost account, and click on Add site:

Add your domain, enter the necessary details.
Viewing/Accessing DNS information in Bluehost:
Now, click on your added website in our first step. Then, under Domains tab, you will see DNS Status : Finish Setup.

Click on Finish Setup button, it will leads you to Site Settings page, where you will see nameservers to update on your domain registrar service provider (namely, IONOS in our case)
But, down below, you will see "Or try connecting with a DNS A Record" link. Click on that:

There, you will find the necessary information on what records you need to update on your domain registrar dns records.

Copy your new A record address, then head over to your domain registrar service provider (in our case, IONOS).
Finding DNS setting for your domain in IONOS
Now, we just need to update our DNS record in the domain registrant service provider's dns setting, so that we can successfully host our thing in another service provider. For this, go to IONOS account, and under MENU, choose Domains and SSLs.
From the list of your domains, click on 3 dots (...) and click on DNS

Bangg, you got your dns settings for the domain. Go to the DNS tab.
Updating the DNS A-record
Now its the time to edit our existing A-record and update field value with copied A-record address from Bluehost (hosting service provider) we obtained from our second step.
Click on edit icon there and just paste the IP address copied, and save the changes.

I hope this article helps you on setting up your hosting service in different hosting provider, along with keeping all domain registered in one service provider.
If you want to connect your cloudflare website to your github website, watch below video:
I host my websites using babal host service. If you are looking for efficient hosting, I genuinely recommend based on my own experience: