Google Ads

In google ads dynamic ads are helpful to promote your brand in all across the web?

Are you specifically asking about Dynamic Search Ads? If so, yes they're a good way to promote your business but I think you'd need to have a strategy that includes more than that.

Don't just run DSAs - run a traditional search campaign, a remarketing campaign, and if your budget allows also run a responsive display campaign. All of that combined can help get you the most visibility for your budget.

Also make sure you've got conversion tracking set up so you can see which channels are bringing you the best results, and optimize accordingly.

When creating an advert you will have a chance to select the country where you want the ads to be visible. You will have to streamline your campaign and pick the once having a best conversion.

do u need google ads account with budgets,you can directly run ads .

DSA are not useful in my experience. I'm sure some have had success but I don't see any reasons to use them.