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I am going to buy a new bike, would you suggest me for well biking not professional, pls suggest me with price. I have no idea of new ones.
If you're new to the sport then between £400 and £700 will get you something good to start on that won't be a total waste of money if you decide you don't like it.
Look for 27 gears, hydraulic disc brakes and ideally a Rockshox branded fork.
Assuming from your user name that you're a lady then women's specific bikes are a good idea if you're below 5'5", if you're above that then look at both men's and women's and decide the best deal.
Buy from a shop, not online, so if something goes wrong you can go back and get it fixed and you can sit on and look at the product to make sure you like it.
Good bikes at that price include the brands Cube, Giant, Specialized and Trek. There are a lot more but these are good value starting points.