What is the best way to create a classified website like Gumtree or Cragislist?

I have seen people recommending Wordpress themes but I don't know if that is the best approach. I am thinking about building a small website where people could post project or tasks and other people could apply to them. So I will need log-in, search functions, categories, tags and so on... I am a Front-end Developer and I don't have much knowledge about back-end languages but I can learn for sure. Thank you
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