Best Way to Earn Delta SkyMiles with Everyday Purchases?

I've been trying to build up my Delta SkyMiles stash and wondering what the best way is to earn them with everyday spending. I've got the Delta SkyMiles Gold Amex, but I'm curious if that's the best card to stick with for regular purchases.

I know there are some Amex cards that offer membership rewards points, which can be transferred to Delta, but I'm not sure if the transfer ratio is worth it. Anyone here have a good strategy? Do you think it's better to use a card that directly earns SkyMiles, or should I look into something like the Amex Gold or Platinum for the transfer opportunities?

I mostly spend on groceries, dining, and a bit of travel, so any advice would be awesome. Bonus points if you've got tips on any current signup bonuses I should jump on. Thanks!

I'd say if you're mainly spending on groceries and dining, the Amex Gold could be a good option. It gives 4x points on dining and groceries, which you can transfer to Delta at a 1:1 ratio, though there's a small transfer fee. The Delta cards are straightforward for SkyMiles, but you might get more value from the Gold if you maximize those categories. As for signup bonuses, they change often, so keep an eye out for offers. Sometimes you get more points with a higher spend requirement, but it can be worth it.