Too wide a question really Guest. You need to Google 'How to prune a grape vine' really for a detailed explanation.
In principle, fruit is borne on new growth which emerges from the old stem/wood of the previous year. There's always a choice between lots of small grapes or fewer better quality ones. You can prune to keep your grape as a single short vine with a few bunches or allow it to produce a very long vine with lots of bunches.
More problems are caused by lack of pruning than by too much.
Beyond that, grapes grow easily in most soils and are extremely hardy. Some varieties like Black Hamburg are very vulnerable to mould and mildew, especially grown indoors.
It's a big subject so I suggest you read up by finding articles about grape culture.