Mathematical logic can be a challenging subject for some students due to its abstract nature and the need for precise and rigorous reasoning. The subject often involves the use of symbols and notation that may be unfamiliar to students, and the concepts can be difficult to visualize. Additionally, the subject requires a high level of mathematical maturity and proficiency in algebra and calculus.

Another reason why some students may find mathematical logic difficult is that it is a relatively new and interdisciplinary field, which draws on concepts and methods from mathematics, philosophy, computer science, and linguistics. This can make it difficult to identify a clear path of study, and students may struggle to see the practical applications of the subject.

However, with proper guidance and practice, students can develop the skills and understanding necessary to succeed in mathematical logic. Many universities offer courses and resources to help students learn the subject, and there are also numerous online resources available. It is important to approach the subject with an open mind and a willingness to engage with the material in a rigorous and systematic way.

As far as I understand you mean symbolic logic which is taught in very elementary level in high schools in many countries nowdays in maths and/or introductory philosophy. To learn at an advanced level is considerably very difficult but very useful type of maths which I learned while studying philosophy online BA degree after my MD & PhD . I consider that advanced symbolic logic must be taught at all STEM majors. Once you learn cosiderably well you want to further your knowledge since it also improves intellectual capacity in many ways...