Slight format stumble: upon encountering a table with a “Cost of tier” column immediately after a paragraph whose topic is “how to read this guide”, my mind initially interpreted it pretty strongly as “this is how much it will cost me to obtain that part of the guide”. Something like “Cost of equipment & services” would be clearer, or “Anticipated cost” (even by itself) to also suggest that the pricing is as observed by you at time of writing (assuming this is true). You could also add a sentence like “The guide itself is free of charge, but some of its recommendations involve purchasing specific equipment or services.” to the previous paragraph.
Slight format stumble: upon encountering a table with a “Cost of tier” column immediately after a paragraph whose topic is “how to read this guide”, my mind initially interpreted it pretty strongly as “this is how much it will cost me to obtain that part of the guide”. Something like “Cost of equipment & services” would be clearer, or “Anticipated cost” (even by itself) to also suggest that the pricing is as observed by you at time of writing (assuming this is true). You could also add a sentence like “The guide itself is free of charge, but some of its recommendations involve purchasing specific equipment or services.” to the previous paragraph.