Yes. External links are good for SEO. Don't think of external links as you are giving your visitors a path outside of your website. But see them as an important metric for high-position ranking. Putting external links in your content shows Google that you are giving value to your visitors, and leading them to every information they need.
We are not talking about tons of external links. One or two external links within your article are great
However, you can't. just put any link on any website. The link should be for an authoritative website with a high domain score to give strength to your content.
Statistics showed that content with external links rank higher than that focusing on its own site only. Therefore, make sure to add one or two external links for each content.