How to tie lines "Train knot" If you use thin PE, it might come off easily! ? 

How to tie fishing line and fishing line
The ``train knot'' is a typical way of tying lines together.
When nylon lines are tied together, the binding strength is extremely strong, reaching close to 80% to 100% strength.
However, when connecting PE line, especially thin PE line of size 1.5 or less, to the leader, the strength is very weak.
Even if you tie it properly, the binding strength is only about 50%, so
To be honest, even if you are a beginner,
"Albright knot", "fire knot" and "SC knot" are recommended.
▼Albright knot
• PEラインとリーダーの結び方「オルブライトノ...
▼Fire knot
• PEラインとリーダーの結び方「ファイヤーノッ...
▼SC knot
• PEラインとリーダーの結び方「SCノット」　...