You can give your clients credentials to update the site (blogposts, page content) without access to major changes that may broke the site. The block based editor is easy to use.
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Domains
https://www.namecheap.com is pretty good.
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Hosting
https://www.dreamhost.com a shared server for $10/month and you can have unlimited WordPress websites witj low/mid traffic and the installation is a breeze.
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Design
You will be limited on look and feel adjustments, be careful with buying commercial themes that comes bloated with plugins and subscription based stuff. Here some free and high quality themes https://andersnoren.se/teman/
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You may like this plugins:
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SEO
For basic SEO stuff. You can disable the constant nagging to go pro. https://wordpress.org/plugins/wordpress-seo/
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Extra blocks
If the native blocks of the editor are not enough this is a good expansion. https://wordpress.org/plugins/coblocks/
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Inject code
If you need to add some code snippet like Google Analytics https://wordpress.org/plugins/insert-headers-and-footers/
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Analytics
A basic analytics tool that is hosted locally without calling a third party https://wordpress.org/plugins/koko-analytics/
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Multilingual
If you need a site on multiple languages https://wordpress.org/plugins/polylang/
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Forms
If you need to add some forms to the site https://wordpress.org/plugins/wpforms-lite/
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Hope can help!