TIP #2: When setting up your manual camera settings, set your aperture second.
When you have your camera on manual [M], and after setting your ISO first, I would recommend setting your aperture second. Aperture is the hole or opening in your lens that lets in light. The size of the opening determines how much light comes into your camera as well as how sharp or blurry the background is going to be in your image.
The aperture setting is also known and referred to as “F-stop”. These terms can be used interchangeable. The smaller the F-stop number, the more light that will be able to enter your camera. For example, F2.0 will allow a lot more light to come into your camera than the setting F16. You can keep learning about aperture more here.
Aperture is what you use to control and create that blurry loveliness behind the subject, often referred to as bokeh. This picture below was taken with an aperture of F2.8 and the leaves and sunlight have become blurry and soft behind the little girl.