Connecting words.
Words which you can use to help with your explanation.
Starting
You can say - "Well" "First of all" "You see".
(You can use those words before the phrases giving explanations which you learned in the previous section. Those words will make your explanation more fluent - see the example below.)
Going on
You can say - "Next" "And then" "Also" "After that".
(You can use these words before adding another piece of information to your explanation.)
Finishing
You can say - "So" "Finally" "That's why" "In the end" "As a result".
(These phrases tell that you are finishing your explanation.)