Reference the first paragraph of the essay and the main thesis that was put across there. This is a very positive way to start the conclusion. Linking the conclusion to the opening paragraph where the main argument or thesis should be outlined gives the essay or article a circular narrative which is a respected writing style. Show how you have answered the question using the evidence you have gathered. This is a good way to open the conclusion.
A different but useful way to open your conclusion could be to include a quotation. Find a relevant quote, for example, by an expert or writer that is in line with your argument. You could also use this to close your conclusion as quotes make for witty and intelligent endings. This is a good way to add a sense of completion also.
Redefine and clarify your argument then discuss the implications of it in the main part of your conclusion. Do this by outlining what the argument is about, what the meaning of this is, and what the effects of this may be. Reiterate the main features of the thesis and analyze them in relation to the points you have put across in the main body of the article.
A vital feature of the main content of any good conclusion is a summary of all the main points in the essay or article. You can include this by going through the essay or article and picking out the major arguments and pieces of evidence. Funnel them into a shorter precise summary in the conclusion. Do not, however, just copy these main points. Analyze and relate them back to the overall thesis or argument.