A mentor, teacher or guide will not only teach you the basics in the order of importance and how you should know it, but will also share with you their experience, and that can be very invaluable.
Some early mistakes in trading are capable of ending your trading career. A mentor, teacher, or guide can help you avoid some of these major pitfalls.
Yeah, I can say that a mentor is quite important for beginners to be able to navigate the trading market quickly and more safely. Mentors will provide various lessons and their experiences well to beginners, and beginners can ask about various things about trading to their mentors and that will be able to avoid them from mistakes that are commonly experienced by beginner traders and allow them to establish a better foothold in the trading market. However, getting a mentor requires money, or if you are lucky someone can get a mentor for free but it is very rare for a professional trader to be willing to teach for free. Therefore, a beginner if he does not have money then he does not need to force himself to get a mentor for his trading - just learn by yourself slowly through Youtube, books, or other sources, that should be enough.