Return a value when target cell is non-blank

Hi hope you are well

need an if formula to say that in Cell A1 is a heading called description and needs to be in bold
if there is data in cell A3 then put data as a paragraph if not leave that cell and output blank

need an if formula to say that in Cell B1 is a heading called ingredients and needs to be in bold
if there is data in cell B3 then put data as a paragraph if not leave that cell and output blank

need an if formula to say that in Cell C1 is a heading called size and needs to be in bold
if there is data in cell C3 then put data as a paragraph if not leave that cell and output blank

need an if formula to say that in Cell D1 is a heading called highlights and needs to be in bold
if there is data in cell D3 then put data as a bullet point or unordered list if not leave that cell and check for data in cell E3 for the next bullet point if Cell D3 doesnt have any, vice versa

Need an if formula also to say that in Cell G1 is a heading called Exclusion from free shipping and needs to be in bold
if there is data in cell G3 then input data as a paragraph or output blank

need all these formula one by one and all should work in html
will put up a sheet for reference

Thank you in advance