Tak?

class Skill extends React.Component {
    state = {
        content: []
    };

    componentDidMount() {
        axios.get('http://localhost:8080/api/skill')
            .then(res => {
                const content = res.data;
                this.setState({content: content.content})
            })
    }
    render() {
        return(
            <ul>
                {this.state.content.map(skill => <li>{skill.name}</li>)}
            </ul>
        )
    }
}

export default Skill