Here's an easy way to check your writing for possible plagiarism:
CC BY NC SA via EasyBib
Consequences of plagiarism could include no or reduced grade for a piece of work or a subject as a whole. Beyond secondary school, consequences can be as severe as expulsion from a course for repeated and/or very serious incidences.
The best way to avoid plagiarism is to ensure you keep track of all resources used (Google Keep can be a great help to do this), and to reference properly including providing in-text citations and a full reference list or bibliography.
Referencing your work. (2015.). Retrieved from https://fuse.education.vic.gov.au/Resource/LandingPage?ObjectId=f5950bbc-0a37-447d-ad1e-2d685f67eac1&SearchScope=Secondary