You can use this as a roadmap while preparing for LLD interviews. I will come up with a detailed material with informations like situations where a each pattern can be applied.

NOTE: Below are 2 seperate lists - list of different practice qns for LLD and list of good to know LLD patterns. It does not imply that for eg, Design Parking lot using Observer pattern. These 2 columns are 2 separate list, I just added them adjacent for presentation.

Please upvote if this helps !

More - HLD roadmap

System Design practice Qns	Good-to-know Design Patterns
Design Notify-Me Button Functionality	S.O.L.I.D Principles
Design Pizza Billing System	Strategy Pattern
Design Parking Lot	Observer Pattern
Design Snake n Ladder game	Decorator Pattern
Design Elevator System	Factory Pattern
Design Car Rental System	Abstract Factory Pattern
Design Logging System	Chain of Responsibility Pattern
Design Tic-Tac-Toe game	Proxy Pattern
Design BookMyShow & Concurrency handling	Null Object Pattern
Design Vending Machine	State Pattern
Design ATM	Composite Pattern
Design Chess game	Adapter Pattern
Design File System	Singleton Pattern
Design Splitwise	Builder Pattern
Splitwise Simplify Algorithm / Optimal Accounting Balancing	Prototype Pattern
Design CricBuzz / CricketInfo	Bridge Pattern
Design True Caller	Façade Pattern
Design Car Booking Service like Ola, Uber	Flyweight Pattern
Design Online Hotel Booking System	Command Pattern
Design Library Management System	Interpreter Pattern
Design Traffic Light System	Iterator Pattern
Design Meeting Scheduler	Mediator Pattern
Design Online Voting System	Memento Pattern
Design Inventory Management System	Template Method Pattern
Design Cache Mechanism	Visitor Pattern
Design LinkedIn
Design Amazon
Design Airline Management System
Design Stock Exchange System
Design Learning Management System
Design a Calendar Application
Design (LLD) Payment System
Design (LLD) Chat based system
Design Food delivery app like Swiggy and Zomato
Design Community Discussion Platform
Design Restaurant Management System
Design Bowling Alley Machine
Design (LLD) Rate Limiter