Beginner BACKYARD POND Build - Mistakes were made

First time making a pond and pretty satisfied with the end results. Hopefully in watching this you take away some tips and do it better than I did. Below all the major items I bought off Amazon:

Submersible Pond filter (1180 Gallons) - https://www.amazon.com/gp/product/B07ZD6V3TJ/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1

Pond Boss Filter - https://www.amazon.com/gp/product/B0068MW50M/ref=ppx_yo_dt_b_asin_title_o04_s01?ie=UTF8&psc=1

API Pondcare Accu-Clear Water Clarifier - https://www.amazon.com/gp/product/B001D0Y9RG/ref=ppx_yo_dt_b_asin_title_o07_s01?ie=UTF8&psc=1

800 GPH Pump - https://www.amazon.com/gp/product/B07L54HB83/ref=ppx_yo_dt_b_asin_title_o07_s00?ie=UTF8&psc=1

UV Light 11W - https://www.amazon.com/gp/product/B07L41X854/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1

Pond Liner Firestone 45mil - https://www.amazon.com/gp/product/B000G0GDJ6/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

Aquanique Pond liner (first one) - https://www.amazon.com/gp/product/B00URO0DDI/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1

Pond Underlay - https://www.amazon.com/gp/product/B005G6TOFU/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1

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