Any tips on applying weed and feed?

According to the previous owner a mixture of centipede and St Augustine.

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What kind of grass you got?

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Bermuda

REad the instructions carefully.

There are many different weed and feeds, even within the same company. And they have different instructions.

Glad you’ve done research/reading on the subject and you’ll need to do the same with herbicides. The herbicides recommended will depend on the weeds you’ll need to control.

But for starters here are some to consider, and you are not restricted to any particular one

Post-Emergent Weed Control on St Augustine and Centipede

Broadleaf weeds (liquids) - Atrazine (not safe for Bermudagrass), Fertilome Weed-Free-Zone (Trimec mixture), MSM Turf (metsulfuron methyl), Celsius..

MSM Turf and Celsius don’t have temperature restrictions, and Weed-Free-Zone and Atrazine you don’t want to use when temps exceed 90 F. All these you should add Spreader/Sticker (surfactant) to the solution

Sedges (nutgrass) if you have it. Sledgehammer (halosulfuron) or perhaps Image for Nutsedge

Grasses you don’t want, for example crabgrass or Bermudagrass - sethoxydim (Fertilome Over-the-Top II)

If you can spray weeds when young you’ll get better control, and if applied at high temps, expect some yellowing of your lawn but it will recover.

And of course, absolutely read the directions on the herbicide labels and follow them.

In fall, September consider using granular pre-emergent herbicide, and do so again the early spring (by mid-Feb).

This should get you started. Lots of knowledgeable people on this board on lawn weed control and lawn fertilization. They’ll provide other good suggestions/recommendations.

I personally rather liquid weed killer (leave the grass tall) then a few weeks later apply granular fertilizer.