In the beginning at first at the beginning of to begin with

at first表示首先,后面依次使用second,third...或者then
At first,i thought he was right,but then i found he was wrong.
at the begining表示在.刚开始之时,we are just at the begining of our life.
似乎没有in the begining 这种说法.
一、 to start with
（1）以…开始；从…着手；有…作为开头；
· A thousand li journey starts with the first step.
千里之行,始于足下.
（2） 首先；第一；起初;最初
· To start with,we have the correct leadership of the Party.
首先,我们有党的正确领导.
二、to begin with
以…为起点；开始（做）…
Knowledge begins with practice.
认识从实践开始.
The ocean began with little drops of water.
海洋是由小水珠组成（起源于水珠）.