hi, my name is hotcat and i am 18 years.

How would the previous sentence be correctly capitalized?
Answer: Hi, my name is HotCat and I am 18 years.
so what does this teach us? definitely healing is conditioned on faith – either on the part of the one needing healing or on the part of the minister of god who prays and anoints.

How would the previous sentence be correctly capitalized?
Answer: So what does this teach us? Definitely healing is conditioned on FAITH – either on the part of the one needing healing or on the part of the minister of God who prays and anoints.
for all products excluding made-to-order items, orders may be cancelled for a full refund at any time until the order is shipped.

How would the previous sentence be correctly capitalized?
Answer: For all products excluding Made-To-Order items, orders may be cancelled for a full refund at any time until the order is shipped.
we humans need oxygen to breathe and oxygen needed for something to be able to burn, the more oxygen, the better it burns.

How would the previous sentence be correctly capitalized?
Answer: We humans need oxygen to breathe and oxygen needed for something to be able to burn, the more oxygen, the better it burns.