It depends on where are you uploading your pictures. Irrespective of the place, you watermark must be small enough not to cover much of your photo. You can keep your watermark mostly around bottom corner.  

The only thing you need to do so is a DSLR.

It also depends on  DSLR as to which type of AF technology  it uses or what are the diffrent types of focus points that the camera has.

And just automatically or manually focus your subject and you are ready to go.

By this you should be ok to focus on.

Use lense which has the lowest aperture.

Lower the aperture the you will get the nice blur background.

Or even if you dont have a good lense just put the aperture to your lowest.

Hope you will find it helpful.

In the wedding photography you can mostly click candid photos, because the expression we want to capture comes unexpectedly. Portrait photos are the best clicks because in the wedding there are lots people people's gathered, so it is very difficult to get required space. Thank you 🙏💕. 

Its the Aperture that is denoted by f and it is also known as f stop.

The diffrence between both  is that f/1.4 lets you get more light to your image.

rather f/1.8 lets you get less light in your image.

More the aperture less the light and less the aperture more the light .

and one of the main use of it is the depth of the field.

Suppose you want your background to be blurred at a good rate then use as low apeature as you can.

Hope you will find it helpful.

In any lens, elements are the specific lens pieces used and how are they arranged to obtain a particular feature, the arrangement is the group. Lenses pieces are usually arranged in groups. In lens, say if it is a zoom lens, it will have more number of elements and groups, where as for a prime lens, it will have less number of groups and elements. 

Usually it is termed as the more number of groups and elements, the better the quality but it is not always true. Lens quality also depends on the type of glass, design mechanism, manufacturing process of the lens. So for a particular focal length, a prime lens would be better than the zoom lens.

Prime lenses usually perform better than zoom lenses.

A wedding i a magical event. It happens just once and so is it divine. It is the responsibility of the photographer to capture each and every sequence of this divine occassion in its true colour. It should not be all artificial, but it should have something that they do for the love of doing it. 

If it is your first DSLR, then no.If you have a lens kit already there is no need for that. If the price between a body, and body + kit lens is negligible, then it’s ok to get one with the lens, if you’re just starting out and have no other lenses.Some kit lenses are paired quite well with their camera bodies, and do perform decently.Experiment with the kit lens, discover shortcomings, if any, and use it to help decide what to purchase next as you learn and progress.