Adding a point
Note: además can also start a sentence: Además, es más rápido.
Contrast: but, however
Note: sino replaces pero after a negative to correct it: no A sino B.
Cause: because, since
Note: como must start the sentence; porque cannot.
Consequence: so, therefore
Note: así que is spoken; por lo tanto is the safe written choice.
Concession: although, even if
Note: aunque + indicative states a fact; + subjunctive leaves it open or dismisses it.
Purpose: in order to, so that
Note: para que always takes the subjunctive.
Aunque: a known fact, or an open possibility?
Aunque takes either verb form, and the choice changes the meaning. The indicative is the ordinary verb form for facts. The subjunctive is the form for things that are not known, not yet real, or not relevant to the decision. See the subjunctive for the forms. English works the same way, so it helps to compare with our guide to English transition words.
A model paragraph: tourism in the city
Connectors are in red. Every word has its English meaning underneath.