So far as I am aware, Win 10introduced more secure systems and closed some known security breaches.
See here for the Microsoft perspective:
https://www.techrepublic.com/article/windows-10-heres-why-it-beats-windows-7-on-security-says-microsoft/
However, in exchange for being free. Win 10 does not give you any choice about updates and additions. Inevitably, some of these will have security holes that will need to be patched before they are no longer a concern.
As with many things, the best option is to learn a bit about vulnerabilities and research the best defences.
Fortunately, there are many online resources for that.
Moneysavingexpert is one; others such as TechRepublic tend to be a bit geeky and less user-friendly.
The link above is a good starting point. (
https://www.moneysavingexpert.com/utilities/free-anti-virus-software ) Otherwise there are many here who can offer their own advice and experience