The phrase sola scriptura is from the Latin: sola having the idea of “alone,” “ground,” “base,” and the word scriptura meaning “writings”—referring to the Scriptures. Sola scriptura means that Scripture alone is authoritative for the faith and practice of the Christian. The Bible is complete, authoritative, and true.
https://www.gotquestions.org/sola-scriptura.html
More at the link above.
In the Scriptures we have what is needed to have a saving faith in Christ and how to develop that relationship with Him.
Except nowhere does the Bible say that it is the sole authority. Indeed, Acts 15 shows that the Church can teach with the authority of the Holy Spirit. Thus the Bible itself refutes sola Scriptura.
Nor can reliance on sola Scriptura resolves the disputes about what the Bible means. We need go no further than "This is my Body." A whole litany could be made out of Bible verses where Catholics and Protestants disagree, not on the authority of the Bible, but on the meaning of the passage. If Protestants truly believed in sola Scriptura, then they would recognize that they have no grounds for insisting that Catholics take a Protestant reading of these passages rather than adhering to there own Catholic understanding of them.