lenovo ideapad s145-15iwl

This laptop has 1 integrated 4GB card and another 4GB card that I can replace, my questions are, what do I need to know before upgrading to a 8gb card, terms like Dual Channel, will it work? I went to https://www.crucial.com/usa/en/scanview/8CBA405231D926C3 and it says I can upgrade to a ram...