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The best and direct way to transfer them is by connecting via USB cable. You can use the charging cable came with your phone to connect to your computer. If you don't have it, then you can buy it from any local shops. The cable you need is Micro USB to USB. When you connect it to your computer with the cable, your computer will ask you to download the pictures automatically. It is a pretty straightforward process.
If you want to transfer it without using USB, there is another way. Download and install Dropbox app on your phone from Play Store. Then register an account and allow camera uploads.
Then on your computer go to www.dropbox.com and download and install it. Sign in to it as well. This will upload all your photos from your phone to Drobox account and then from Dropbox to your computer via internet. You will find all your downloaded pictures in the Pictures > Dropbox > Camera folder. Let me know if you have any difficulty.
If you have any difficulty on following the steps above, please let me know and I will walk you through it.