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For basic insight meditation (vipassana) based on the mindfulness of breathing, you can consider starting with Ven. Yuttadhammo's "How To Meditate" series for beginners, which is available as a YouTube video playlist and as an online book.
This meditation is based on the four foundations of mindfulness (satipatthana). It comes in the varieties of sitting and walking meditation.
After you have mastered this, you can proceed to "How to Meditate II" by the same teacher.
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You may find this source useful: https://www.dhamma.org/en-US/index
Whichever you go for, make sure they are reliable meditation coming from genuine sources and not merely anyone claiming to be teaching or talking about vipassana.