Many online information sources contain features to help you store your search results for later use. In Primo, for example, you can store your search results in your Favourites. Try to get into the habit of storing the records for the information sources you find so you don't have to spend valuable time searching for them again when you are creating your reference list.
There are also online tools to allow you to export search results to reference management software e.g. EndNote. More details are below.
EndNote is a desktop bibliographic referencing application for gathering bibliographic references from online databases; amending, managing and storing references; formatting the references from a range of citation styles provided and exporting the references as footnotes, endnotes and bibliographies into Microsoft Word documents.
Aberystwyth University provides support and training for Endnote users.
EndNote X9 is available to download for free (Windows and Mac) for computers owned by staff and students: https://myaccount.aber.ac.uk/protected/software/
Visit the EndNote FAQs: https://faqs.aber.ac.uk/index.php?search=EndNote
There is a feature in Microsoft Word for creating in text-citations and bibliographies. It is called Citations & Bibliography and you can find it on the References tab in Word.
N.B. you do have to type in the reference details yourself so this is only useful if you are only citing a small number of references. Also it is not designed for use with footnotes.