Is there an article about the fact that the sexual reproduction has existed; before asexual reproduction? I heard something new about it, but I can not find the article.
I don't know if such article exists, but I doubt it. Sexual reproduction is specific to evolved organisms so I would say that primordial organisms had rather asexual reproduction.
i heard sth about sexual reproduction have more advantage in nature contrary to what we think generally as asexual is more simple and due to that, it is more primordial. Some researches mentioned that sexual reproduction more primordial in their research but i can not find this research.
There are some organisms that might have reproduced sexually at some point but now reproduce asexually and for more info you can check the link recommended by Dhia Hussain Jassim Al-Delemi.
Other than that, I doubt that sexual reproduction appeared on Earth before asexual reproduction. However, if you find something describing that, please share it here.