Word press beginner tips (tryin to freelance)

I have tried the beginner things in word press but i have known the words now about the things like elementor,bricks builder,oxygen. and learnt about the premium themes and free themes.I just want to know can I create any website which I have in my mind just using wordpress or do i have to learn these things(oxygen,elementor).And about the themes do i have to purchase new theme for every new client for freelance.And any tips for a person like me whos trying to freelance using the wordpress


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