To Place On Something
To Put On Something, To Put On Record
transitive verb, ichidan verb
Remember how 載る is "to be placed on"? This one is to place on something, like a mug on a table. 載せる is transitive, and you know this because you do it yourself (せる). Like 載る, 載せる also often refers to putting something in a written document or publication, so it can mean to put on record.
Note that 載せる is never used to refer to putting clothing or accessories on. That's 着る or 着ける respectively, which you've learned already.
The reading is shared with 載る, so as long as you remember that you can remember this.
自分の写真をインターネットに載せるのには、ちょっと抵抗があります。
I’m a little uncomfortable publishing my own picture on the Internet.