1: Do you have a smart phone? If you do, load the WGT app and earn credits watching short video ads for 2 credits each. Most videos are between 15 and 30 seconds each. I get around 50 credits every day doing this. ( Much of these while taking care of morning personal needs.)
2: Do you have a PC? If you do load BlueStacks or another emulator and then load the WGT app like you did for your smart phone. You now have access to the same videos that you have on the phone app. Again you can pick up another 50 plus credits in a short time.
3:Under the "get credits" tab using the "free credits" tab it is possible to find some good surveys that will pay. The problem is whether you can qualify. Below the surveys are some various offers, some of which only require watching videos or interacting with a web site.Others may offer credits for registering. If you have a throw away email address, these might be worth investigating.
4: Check the offers under the various tabs for "free credits". Some offers require a purchase to get "free" credits. If there is a product that you intend on purchasing, these can be good for you. I once purchased a needed bicycle pump from a vendor that I had used for previous purchases and got credits for doing so. You just have to access the vendor web sites through the ad on WGT.