Validator test some problems with univer.se web

Hello, i love this universe comunnity and this project, build pages are so lovely easy, realy i like it, but my husband check my web on his computer with AVG and its look like have some problems with page, really many many alerts avg. So i found some articles about it, thats problem with avg too, but i tried validator tests and here are some problems with webpages. So just trying, if iis it possible fix this problems? In Europe in Czechia we need validating pages and i really still want build them on univer.se pro. Can you fix it please? Here is testing text https://www.itnetwork.cz/validator?url=www.deniart.cz%2Fshop

Thank you so much for this super duper projekpct i love it from 2021​:blue_heart::blue_heart::blue_heart:

Wish you all great days Deni

Most of your site is validating very well. The majority of warnings are based on YouTube embeds which could be better but has a low impact on your site since it is Google's content.

This warning is one that you can improve on your own and is worth improving.

Stránka vůbec neobsahuje hlavní nadpis typu <h1>. Musíte jej doplnit! Více informací o nadpisech.

Look for the title of you page and make sure you're using a Large Title style for that Text Block. Google gives special priority to Large Titles and Titles on your page when scanning the page.

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Thank you very much for your answer. I gave the main headings but it doesn't help. It really bothers me avg. Could someone who has avg try my website to see if it also gives them problems and warnings? On the computer. I only have a tablet and a mobile phone, so I have no way to test it. I wouldn't even really use avg, so I have no experience.

As for those YouTube problems, it seems to me that the real universe somehow has those elements through YouTube? Because even the favicon is via youtube, why? It doesn't make sense to me, I don't have anything like that, not even the music track. Check out my website www.deniart.cz

So I added the title to the main page and that solved the problem with the titles, but I don't like the title on the website, so there is probably no other way to validate it without the huge title, right?

But the YouTube stuff really bothers me more, but if it doesn't bother anyone, then I have no reason to deal with it. First and foremost was the problem with avg.