You are going to want to use a plugin. I believe I used WP All Import – Drag & Drop Import for CSV, XML, Excel & Google Sheets – WordPress plugin | WordPress.org to import last time but it has been a long time.
Here are some other resources:
Importing Content >> WordPress Codex
https://codex.wordpress.org/Importing_Content
How to Import WordPress Content – Import Another Blog’s Content Into Yours
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