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hello everyone I have one layout grid for hero section and within are 2 more layers with title and paragraph.Ihave selected for main layout main tag,but under tat layout the next layouts which tags to put on them?section or main again until footer?any help appreciated

Are you saying you are manually writing these tags?. If so then you do not need to do so. The title <title> </title> is automatically written in the html as for paragraph <p></p> when you drag and drop the text object to the page these will be added when you select the output to paragraph.
If you add a header object or footer then again they will both use the appropriate semantic tag for them <header></header <footer></footer> you do not need to write them.
Another use of semantic tag is to use the likes of headings (not to be confused with headers) such as <h1><h2>. Also another semantic is <nav></nav> is used in the likes of menus again you do not need to write anything the software will generate all this.
Note you will only ever need one title <title> the same is for <h1> as a multiple use will cause browser confusion and it is also bad seo.

I select tag from layout grid properties , i use layouts for header , inside layout i put navigation , and for main section