If I take photos in RAW format, are those photo styles useless? What standard portraits and landscapes are just.

Useful, RAW just keeps all kinds of details of photos, such as overexposure and underexposure details, and white balance.

You can open the style settings. In fact, styles like portraits, standards and landscapes are different in clarity, contrast and saturation. You can set it yourself.

Of course, whether it is raw or JPG, it can be adjusted later. It's just that RAW keeps the original data, which gives you more space in the future. JPG only keeps the data you want when shooting, which will damage the image quality later.