Useful lawn advice, without the salesman’s grin.
Most lawns do not need a grand rescue plan. They need someone to notice what changed, make one sensible job of it, and leave the grass time to respond.
How the site looks at a lawn
Start with what is actually in front of you: thin grass by the gate, puddles that keep coming back, a patch that turns blue-grey in dry weather, or a mower that has taken too much off. Then work backwards to the likely cause.
Some jobs are worth doing straight away. Some are better left until the soil warms, the rain arrives or the lawn has had a chance to recover. The guides are written for the UK, but your soil, shade, rainfall and local restrictions still get the final say.
What you will not find here
No miracle cure for every brown patch. No fertiliser recommendation just because it is spring. And no pretending that a drainage failure or subsidence problem is something a bag of seed can sort out.
Worth saying: This is general gardening information, not site-specific professional advice. Get a qualified person involved if you suspect subsidence, failed drainage, buried utilities, chemical contamination or serious plant disease. Product labels and local water-use rules always take priority.