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Thanks for the warm welcome! I appreciate it. My good sir, I’m well aware “autodidact astrophysicist” does and probably most of the time should read like “seriously batshit crazy”. However, I’m also aware that that theories are comprised of roughly two elements: observations, and interpretation of that data; the theory that is more comprehensive and aligns with observation better is the more accurate theory.period. -My school of thought was built on that. Suffice it to say I have little concern for my ability to engage in proper scientific discourse.

Is this really a homework question or just a request for understanding of material you have been presented with in a course or read ? I ask because it looks much more like the latter and such questions can legitimately be asked in the main Chemistry sections. OK so there are several different classification schemes for chemical reactions. Each has its own point of view and the schemes are not mutually exclusive. So you first list is about reactants and products. That is what substances you start with and what substances you end up with. Say A + B = C - combination A = B + C - decomposition or dissociation AB + CD = AD + CB - replacement or elimination and so on. There are further reactions types than your first list in this viewpoint. Your second list narrows down these wider categories in some way. So Acid + Base = Salt + Water Is an elimination reaction where CB is always water and AD is always the salt. (This has been extended beyond water in more advanced Chemistry) If the reaction is in solution and AD is precipitated then this is also a precipitation reaction. So you can see some overlap in the categories beginning to appear. Oxidation is the addition of oxygen or the removal of hydrogen Reduction is the removal of oxygen or the addition of hydrogen Since combustion is one of these (which one ?) It is a redox reaction. Note that all these classification types start with substances and end with different substances. In more advanced Chemistry your will meet others views which are about what goes on during the reaction and the movement of electrons and/or protons from one substance to another. These may be called reaction mechnaism views. Where are you in your studies to have been given the first list as the basic 5 ?