i wish to make a website some precious features

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hello my dear friends i would like to make a website with some precious features but i am very poor about making a website however, i have some friends they have good knowledge about web designing and script designing. so i am gonna invest lot of money here. i am having lot of doubts regarding maintaining a website. If you know following things please comment as possible as you can. 1. Dos protection: i heard that there are a lot of dos protection providing teams. But a lot of dot protected websites have been attacked by hackers so there may be no solution for dos protection write? 2. There are also some teams are providing payment protection for a websites automatic payment process. But a lot of protected websites lost big amount of money because of hacking payment process. So it may be difficult to make good paying website even its payments are protected write? i have a lot of doubts, i can ask if this discussion continues actively.