It is important that you know how to link your ideas/arguments/topics together in an essay. Here are some ways in which you can do this:

 

To link idea of agreement or the same line of thought
In addition,
Furthermore,
Similarly,
Likewise,
Moreover

To link ideas that disagree/contrast ideas mentioned
Yet,
On the other hand,
Nevertheless,
However,
Although,
Otherwise,
On the contrary

To conclude (all of your linked points)
In conclusion,
Thus,
Therefore,
Consequently,
Hence,
As a result

To further examples
Because
For instance,
Since,
For example
So that
Despite the fact that
Accordingly
Although
If,
Unless