The difference between dual channel and single channel is simple. Let's say you are investing into 16GB of RAM. A single stick you purchase runs at a speed of 3000Mhz. Buying two 8GB sticks for a total of 16GB will run faster because in dual channel mode the speed of each stick is added together so your 16GB of memory will run at a speed of 6000Mhz instead of 3000Mhz.
Barracuda drives are great for price/performance
a 1050ti is a better entry level option than a 1050.
and following the guide above for purchasing a PSU is highly advised.
also, In the list below I changed the RAM from Ripjaws 4 to 5. you lose out on 200Mhz of speed but the 5 series is better compatibility.
Tell me your budget and I can put something together for you to get an idea of what you can get and you can then of course take it from there and customize it a little to your liking if you want.
Based right now off of your PCPP list I will give you a build assuming the budget is about $800 give or take.
This of course does not include taxes and possibly any shipping costs for where you live. But retail this is what I put together for you $800
PCPartPicker part list /
Price breakdown by merchant
CPU: AMD - Ryzen 5 1500X 3.5GHz Quad-Core Processor ($169.99 @ Amazon)
Motherboard: Asus - STRIX B350-F GAMING ATX AM4 Motherboard ($91.98 @ Newegg)
Memory: G.Skill - Ripjaws V Series 8GB (2 x 4GB) DDR4-3000 Memory ($101.99 @ Newegg)
Storage: SanDisk - SSD PLUS 240GB 2.5" Solid State Drive ($69.99 @ Amazon)
Storage: Seagate - Barracuda 2TB 3.5" 7200RPM Internal Hard Drive ($59.89 @ OutletPC)
Video Card: Zotac - GeForce GTX 1050 Ti 4GB OC Edition Video Card ($204.98 @ Newegg)
Power Supply: SeaSonic - FOCUS Plus Gold 650W 80+ Gold Certified Fully-Modular ATX Power Supply ($69.99 @ Newegg)
Total Before Rebates: $801.83
Total After Rebates: $768.81
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-01-31 16:07 EST-0500