We have all seen amazing photographs with striking foregrounds while the background blurs to oblivion. That blurred background, commonly referred to as Bokeh, can be controlled by setting your camera aperture effectively. We typically recommend lenses with a maximum aperture of at least f/2.8 because it gives you more creative flexibility and low light possibilities.
With great specs, solid build, and reasonable pricing, can the Tamron hold its own against Canon & Nikon's pricier rivals.
This is an issue I cannot stress enough. You must be diligent about backing up your photos, videos, and other important data, especially if you are using that information professionally.
ISO can be a very important tool in digital photography. It allows you to capture great images in low light when used properly, yet without a firm grasp on the limitations of your equipment, it can very easily ruin your photos. Most digital cameras allow for manual over-ride of auto-ISO. Learning to master when and how to use ISO will be an important step to improving your photographs.