CloudTek Hi
Here are some basic steps:
1.Backup your site
2.Access download section of template and download latest version of template package (not quickstart packages) and extensions >> install into your site
3.Make sure that all other extensions on your site are compatible with Joomla 4 first.
4.Go to Backend >> Components >> Joomla Update >> it will lead you to 'Pre-check update' screen (check the guideline I sent). In this step, it will show you all information of which extensions are ready with Joomla 4 or not. If there are extensions that are not compatible with Joomla 4, you need to update them first.
Then if everything is ready, you can update Joomla.
Regards