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Whether or not grass will fill in bare spots itself depends on the type of grass you have. For example, grass with rhizomes (e.g., Bermuda grass) and stolons (e.g., Saint Augustine grass) will naturally fill in bald spots as it spreads laterally. However, clump-forming grasses will not spread. 

You should fertilize your lawn after it has grown at least two inches or after your second mow (usually in March or April). Applying fertilizer too early can feed your weeds and cause them to grow stronger, too. You should water your lawn two to three days before you apply fertilizer to ensure the soil absorbs it.

The best fertilizer for thick Bermuda grass is an organic fertilizer with an N-P-K ratio high in nitrogen, low in phosphorus, and low in potassium. Organic fertilizers help Bermuda grass grow stronger and healthier by retaining water well, supporting microbiome life, and promoting long-term soil health. However, this type of fertilizer is more expensive than synthetic fertilizers. 

The safest method to avoid killing your turf grass is hand pulling Johnsongrass. You can also apply vinegar for a safer herbicide, but it will still burn your lawn if it gets on it.