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Checking compatibility is the most critical step to ensure your components work together seamlessly. You can verify this through these two primary methods:
Use AI & Compatibility Tools (Fastest): Tools like MSI AI EZ PC Builder or PCPartPicker are the most efficient. They use massive databases to automatically flag potential issues—such as whether your power supply has enough wattage or if your motherboard needs a BIOS update for a specific CPU.
10 Essential Tips to Check PC Component Compatibility

Even if the wattage is high enough, you need to check the connectors.
The 12VHPWR Connector: Many RTX 40-series cards use a 16-pin connector. If your PSU is older (ATX 2.0), you will need a 3-to-1 or 4-to-1 adapter, or a newer ATX 3.0/3.1 certified PSU.
Rail Stability: High-end parts can have "transient spikes" (sudden power jumps). It is safer to use a PSU from a reputable tier-list to avoid system shutdowns during heavy gaming.

No. Memory compatibility is strictly tied to the motherboard's physical design.
Physical Slot: The "notch" (the gap in the pins) is in a different position for DDR4 and DDR5. You cannot physically plug one into the other.
Internal Controller: The way the CPU talks to the RAM is different for each generation. You must choose a motherboard specifically labeled for the RAM type you own.
Use this link to find the compatible memory products for your PC system:
https://www.kingston.com/en/configurator

Not automatically. Most coolers are compatible with both, but they require different mounting brackets.
Check the Box: Ensure the cooler includes "Multi-socket" support.
Newer Sockets: If you are using a very new platform (like Intel LGA 1851 or AMD AM5), you may need to contact the cooler manufacturer for an "Upgrade Kit" if the bracket wasn't included in the original packaging.

Air coolers use metal heatsinks and fans - they're reliable, quiet, and maintenance-free. Liquid (AIO) coolers use water to transfer heat - they offer better cooling for high-end CPUs and look sleeker. For most users, a good air cooler (like Noctua or be quiet!) is sufficient, quieter, and has no pump failure risk.
Use this link to learn more what’s difference between air cooling and liquid cooling:
https://www.msi.com/blog/cpu-cooler-liquid-cooling-vs-air-cooling-what-is-better-for-your-next-pc

You should clean your PC every 3 to 6 months, depending on your environment. If you have pets, live in a dusty area, or notice higher temperatures and fan noise, you might need to clean it more often. Focus on removing dust from fans, vents, and heat sinks to maintain airflow and prevent overheating, which keeps your components running efficiently and extends their lifespan.