Step 1: Topic Sentence. Focus your paragraph with a topic sentence.
Step 2: Supporting Details. Develop your paragraph with supporting details. [You should have between 3 and 6 supporting-detail sentences to ensure an effective paragraph.]
Step 3: Concluding Sentence. Depending on the purpose of your paragraph, you will either write a concluding sentence [which restates the idea in your topic sentence (in different words) or which states what you learned overall].
https://www.riosalado.edu/web/oer/WRKDEV100-20012_INTER_0000_v1/lessons/Mod02_WritingEffectiveParagraphs.shtml