Excuse me 
I usually want to use Bitcoin to buy things, but using Bitcoin for small transactions will incur a handling fee. Is it not cost-effective to make a small payment? Transaction costs are relatively high. If I use the Lightning Network, will I double spend?What do you recommend? Thanks！ 
I usually want to use Bitcoin to buy things, but using Bitcoin for small transactions will incur a handling fee. Is it not cost-effective to make a small payment? Transaction costs are relatively high. If I use the Lightning Network, will I double spend?What do you recommend? Thanks！ Try coinbase.com
If seller has coinbase account you can transfer funds without fees. Check if your favorite shops accepts coinbase payments.