Hi and welcome to the forum
For landscape and architectural photography, the use of a tripod is your best bet. This enables you to keep the camera perfectly still, allowing you to use slower shutter speeds without camera shake / blur.
There's no hard and fast rule for shooting landscapes / architecture as the settings to use will vary according to what you are photographing and how you want the photograph to look. For example, if you were shooting a landscape scene that had a waterfall, cascading down the side of a cliff, you may choose to use a fast shutter speed to capture the individual droplets of water (freeze framing). You may also choose to use a slow shutter speed, to give a more soft, blurred effect on the water.
For a landscape where everything is static, IE no rivers or waterfalls, depth of field is likely to be more important. The depth of field changes according to the size of the aperture of the lens you select. Wide open, it will be shallow, so that if you focused on a tree a few meters away, it would be in focus but everything infront and behind that would be blurred. Generally, for static landscape shots, smaller aperture values are used (f/16, f/18/, f/22, etc.) This is so that more detail in the background is brought into play. Landscape photographers sometimes use a technique
called hyper focal length, whereby at a certain lens length, at a given aperture, the lens is at its sharpest.
For architecture, the same as above applies. In general you want as much detail in the image as possible. More detail means smaller apertures. Smaller apertures mean slower shutter speeds and slow shutter speeds are your friend when it comes to busy landmarks.
By using a very slow shutter speed (usually requires the use of a neutral density filter with a value of 8 to 10), any moving objects get blurred into obscurity. Provided the people or cars in the shot, are moving, they will not get recorded to the image and your shot will be people free.
If you are very new to DSLR photography (and for the purposes of this explanation I will take the liberty of assuming you are, apologies if you are already proficient) and aren't familiar with things like the affect of aperture and shutter speed, I'd suggest you do some experimenting.
Set up some coloured pens on a table in a staggered line, spaced about 6 inches apart or more. Mount your camera on a tripod and select aperture priority mode (think that's Av on a Canon). Adjust the zoom so that all the pens are visible through the viewfinder. Focus your camera on the nearest pen and open your aperture to its widest value (It might be an idea to swich to manual focus mode before you do this so that the camera doesn't accidentally AF onto something else). Depending on the zoom length of your kit lens, this aperture value will be anywhere between 3.5 - 5.6.
Take a photograph. Keeping the focus on the same pen, reduce the aperture size gradually. Try f/8, f/11, f/16, f/22 and beyond if you can. Then compare all the images. You won't have changed the zoom or focus of the camera but, you should find that the pens that were 6", 12", 18" and 24" away from the first pen, gradually become more and more in focus / detailed in the shot.
Next you could experiment with mounting the camera on the tripod and photographing water coming out of the kitchen sink. Put the camera into shutter priority (think that's Tv mode on a Canon) and take a series of shots from 1 sec, up to say 1/2000 sec. You may find that you need to use the popup flash or have a lamp on a nearby counter top, shining on the tap, as the shutter speed goes up as the faster shutter speeds will result in darker images if there is insufficient light. What you are looking for is the difference in appearance of the water.
Once you understand the basic concepts of this, you can apply it to all aspects of photography, whether is portraits or still life, to landscapes or sports/action shots.
Hope that helps