Seo analyzer for V 9.10.20 - some very important change

I user some free seo analyzer site for see what i must to improve for my site to be more good on google search and i have some things that are basics to be maked for a good position in google:
1.) Home page is index.php is important to be just site domain. Site title start with Home - and after that is site title... how can remove Home - ? without change at every update!? Domain name and /index.php have some title meta and isn't ok, can redirect index.php to domain name on all site?
2.) Sitemap - i user a sitemap from RobiNN but in last time don't work and i get an errror... is posible to be error because my locale is Romanian?
3.) H1 on title - No H1 tag was found. For the best SEO results there should be exactly one H1 tag on each page.
4.) On my site are 12 pages - Duplicate meta descriptions who to fix this?
5.) Something about redirect but i don't understand very good this. WWW Canonicalization? Does your site appear on more than one URL?
The www and non-www versions of your URL are not redirected to the same site. This website uses URLs with www and non-www subdomain. This may cause duplicate content and bad links to your website.
6.) Schema Meta Data ?Does your content include relevant Schema.org metadata? No Schema.org data found on your page.
7.) Last but very important is from Google console that said: Page is not mobile friendly - This page can be difficult to use on a mobile device. Issue - clickable elements too close together and text too small to read on mobile.

Can help me someone to solve this? Maybe is important to be consider this point important for next update at version 9.10 for all users?

I use 5 analyzer and this 7 are common problems on all.