Plagiarism Self-Check Guide

I want to check my writing for potential plagiarism issues. Here is my text: [YOUR TEXT]. The original sources I used are: [SOURCE INFORMATION]. Areas I'm concerned about: [SPECIFIC CONCERNS]. My understanding of the source material: [YOUR UNDERSTANDING]. Please help me: 1) Identify passages that may be too close to original sources, 2) Suggest proper paraphrasing techniques, 3) Indicate where citations are needed, 4) Distinguish between common knowledge and citable information, 5) Teach me strategies to avoid unintentional plagiarism.