Customize website on Wordpress

Website:

1.1 Remove, upgrade, install new plugins, depending on your recommendations.
1.2 Other settings of wp
1.3 Setting up hosting?

2. Check that you correctly configured robot.txt and sitemap. Some special search engine optimization is not required.

3. I would like to have regular backups of files and database are not on the hosting servers. I don't know what options the easiest way to organize.