Just on point of fact, contrary to aqwsed12345 above, the latest edition of the BDAG Lexicon says that “first created” is the probable meaning of “beginning” in Rev 3.14. The full entry for the Greek word in that Lexicon can be read on the following blog, the relevant comment coming under the paragraph numbered 3.
https://fosterheologicalreflections.blogspot.com/2017/03/revelation-314-and-bdag-edited-for.html
(Oops, I see Blotty has already quoted this entry. Sorry for overlooking that. However, it makes aqwsed12345’s subsequent inaccurate statement all the more curious.)
Another thing that should be taken into consideration when looking at texts such as Rev 3.14; Col 1.15, John 1:1 and so on is that these passages are clearly drawing on the Jewish Wisdom tradition. In that tradition Wisdom was spoken about as God’s first creation, an archangel, or principal angel beside God. Therefore it’s entirely within the cultural context of the period to understand these passages in the NT along those lines. It’s those who wish to read those passages within a fourth century Trinitarian context that are interpreting them outside of their historical setting.
Elsewhere, of course, the NT also makes a careful distinction between God as the source of creation and Jesus as the one through whom God created. Interpreting this verse to say that Jesus is the source of creation would seem to contradict those other passages. (John 1.3; 1 Cor 8.6; Col 1.16; Heb 1.2)