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H is never a central atom, so you know that for sure. You then look at the other two elements, C and O. C is the central atom because it has the lowest ionization energy. So connect C and O with a bond, and then put 3 H's on the C and one H on the O. Don't forget to add 2 lone pairs to O.
The central atom is normally determined by the element with the lowest ionization energy, in your case with the example, CH3OH, carbon. However, if its finding the Lewis structure for HOCO for example, then you would write it straight out like that (H-O-C-O) since it is written in that manner.
You look for which one of the elements have lower ionization energies. Also you can usually rule out hydrogen as it tends to never be in the middle. Ionization energy increases across and period and decreases as you go down a group
The atom with the lowest ionization energy should be the central atom. Since C has the lowest ionization energy, it should be the central atom. Carbon is also tetravalent, so being the central atom makes it easier for carbon to get its four bonds.
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