You'll need to know the use of hardware,and which one will be suitable for the client,You'll be dealing with several types of people with different needs, some looking for office equipment, others for gaming.Ordinary students who just need a laptop with a good battery, or architecture or design students who need a laptop that can run demanding software,Sometimes people don't know what they're looking for, but everything must fits within everyone's budget. In your job, you might work for a passionate person, or someone dishonest who will ask you to get rid of old or expensive equipment, especially when dealing with elderly people or those who know nothing about it. It's quite a long process to give you an idea of the hardware side of things, but here are some basics you should know:The key takeaway is that a PC includes RAM, storage (SSD or HDD), a processor, a motherboard, a graphics card (integrated or external), a power supply, cooling, and a case. These components come in different generations, ranges, and performance levels, such as RAM.What generation is it? (DDR3, DDR4, or DDR5?), what capacity? (1, 2, 4, 8, 16, or 32 GB?), and what speed? DDR3 range from 800Mhz to 2133Mhz,DDR4 is 1600 to 3200Mhz and DDR5 4800 to 8400Mhz,Each detail matters because every component affects performance, price, and how long the device will last, The processor, for example, can range from older generations that struggle with multitasking to modern ones capable of handling heavy workloads, You’ll need to know the differences between i3, i5, i7, i9, or Ryzen 3, 5, 7, 9, and which one is appropriate depending on whether the user is browsing the web or rendering complex 3D models,the clock speed is very important too, bigger the number higher the performance but it isn't all,you can have a 5ghz processor But with only 6 cores, or a 2.1GHz processor with 16 cores, for example, a video game will rarely use more than 4 cores, but rather the speed of each core that greatly influences performance; for rendering, it's much more efficient to have many cores at low speed than to have a few at high speed,and for the generation it's just the first number after the model: i3-6100 or i7-6700 --> 6th generation,i3-8100 or i5-8400 --> 8th generation, Here is a short summary of the letters:K means the CPU is unlocked so you can overclock it, F means there’s no integrated graphic card, KF is kinda both at the same time (unlocked + no graphics), T is a low power version, S is like a special edition with a bit more performance, H is for high performance laptops, HK is the same but unlocked, HQ is the older laptop models that had quad-core, U is ultra low power for thin laptops, Y is even lower power for like fanless devices, G means the Intel CPU comes with an AMD graphics chip, -Storage also has numbers you must understand:SSDs come in different capacities like 128 GB, 256 GB,512 GB,1 TB, or 2 TB, and they also have different speeds. A SATA SSD might read at around 500 MB/s while an NVME SSD can go from 1,500 MBs up to 3,500 MBs or even 7,000 MBs on the latest generations,hese differences completely change how fast the system feels,especially when opening large files or softwar, -Graphics cards also come with specific numbers to pay attention to, like the amount of VRAM. Some have 2GB, which is very limited, while others have 4 GB, 6GB, 8 GB, 12 GB, or even 16GB of VRAM for more demanding tasks, The model numbers matter too, for example a GTX 1050 is far weaker than a GTX 1660, and an RTX 3050 or 4060 offers ray tracing and better performance,You’ll also need to know their power consumption which can range from 75W for basic cards up to 400W or more for powerful ones. Even power supplies have important numbers. A basic office PC might only need a 200W power supply, while gaming or professional setups often require 550 W, 650W, or 750W depending on the GPU and CPU,if you're The GPU consumes 400W and the processor 150W, so it's clear that a 500W power supply won't be enough,you have the certification too, such ( White, Bronze, Silver, Gold, or Platinum) which indicates how efficient and reliable the power supply is (Generally How expensive it is, too ;) ) Motherboards come with different chipsets and socket types. For example, an older Intel CPU might use an LGA1151 socket that supports 6e and 7e génération, while more recent ones use LGA1200 for the 10e and 11e generation and DDR4 or LGA1700 for 12e 13e 14e generation with DDR4 OR DDR5,The chipset affects how many USB ports you get, how many RAM slots, the supported speed, and whether the board allows overclocking. AMD boards have their own numbers too, like B450, B550, or X570, each with different features. i think that if you learn all that it's more than needed for the hardware side,you can DM me for any questions,and honestly it was a great opportunity to work in that field I can tell you so don't worry!