Yes. It's use of all category websites.

classified ads posting is good...........

yes it is. classified submission is best way of new site promotion. it will help to improve the traffic.

It is an effective and can help in boosting the website traffic.

Classified websites may not helps to improve your ranking. Only use is we can get leads.

Yes , Classified ads is one of the effective off page activity in Link Building

classified sites very helpful for ad posting and business promotions

Yes of course. It is good and well for promote the website in all search engine

Classified ads will help to make more visibility and can get better traffic and visitors to your website.

Classified ads posting is a good way to promote your website.It will generate more leads to your business

It is one of the best method for promoting an online business and generating visitors for a website.

Classifieds
 

Simplified; classifieds (horizontal or vertical) are platforms that connect buyers and sellers online and leaves it there.
A marketplace facilitates some form of transaction via technology enablement by moving down the value chain i.e payment gateway, service fulfilment, etc.

a type of advertising, traditionally found in newspapers and periodicals, now also common online, where individuals or businesses can post short, text-based advertisements to buy, sell, or exchange goods and services.