Tips to a 1 yr experience fresher to crack FAANG/MAANG

Hi, I am currently working as a software developer and have 1 year of experience. I am planning to switch companies this year and have started preparing for it. My goal is to crack FAANG/MAANG. 1. I’ve heard a lot about Leet code, HLD, and LLD, and I’ve already started practicing LC problems. However, I want to understand whether, apart from data structures, algorithms, and system design, companies also ask about core computer science concepts such as DBMS, Operating Systems, and Computer Architecture. 2. Do they also ask questions related to the tech stack I’ve worked on in my current company? 3. I have done some research online and found that big tech companies mainly focus on LC style problems and system design. Is that actually true?