Hi there - The simplest thing to do is to:
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choose a url variant (either with or without /) and apply it consistently across the site.
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say you choose the "without /" version. Redirect all "with /" versions to the without version.
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make sure the rel=canonical of each page points to the variant you choose (either the with or without traling slash variant).
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when linking to a page on your site (from a banner for example) try to link to the variant you choose, otherwise Googlebot has to follow a url redirect unnecessarily, which is an inefficient use of your crawl budget.
I hope this is clear.
Thanks!