der Slowene
Slovene
A male citizen of Slovenia or a male person of Slovenian origin.
Der neue Spieler in der Basketballmannschaft ist ein Slowene aus Ljubljana.
The new player on the basketball team is a Slovene from Ljubljana.

Slovene
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Slovene
A male citizen of Slovenia or a male person of Slovenian origin.
Der neue Spieler in der Basketballmannschaft ist ein Slowene aus Ljubljana.
The new player on the basketball team is a Slovene from Ljubljana.

'Der Slowene' (the Slovene) is a noun of the N-declension. This means it takes the ending '-n' in all cases except the nominative singular: genitive, dative, and accusative.
Ich habe dem Slowenen den Weg zum Bahnhof erklärt.
I explained the way to the train station to the Slovene.
This word belongs to a word family that refers to the country 'Slowenien' (Slovenia). It also includes the feminine form 'die Slowenin' (female Slovene) and the adjective 'slowenisch' (Slovenian).
Die slowenische Küste ist sehr schön.
The Slovenian coast is very beautiful.
The plural form ('die Slowenen', the Slovenes) is identical to the forms for the genitive, dative, and accusative in the singular. Only the article and the sentence context show whether one or several people are meant.
Ich spreche mit dem Slowenen. (eine Person, Dativ)
I am speaking with the Slovene. (one person, dative)
Slav
'Slawe' and 'Slowene' sound similar and both have to do with people from Europe, but they mean different things. A 'Slawe' (Slav) belongs to a large group of peoples and languages, for example Poles, Czechs, Russians, Serbs, or Croats. A 'Slowene' (Slovene) is a person from Slovenia or of Slovenian origin. Learners can easily confuse the words because the forms look similar. The important point is: every Slovene belongs linguistically and culturally to the Slavs, but not every Slav is a Slovene.

Mein Kollege ist Slowene und fährt jedes Jahr zu seiner Familie nach Ljubljana.
My colleague is a Slovene and goes to Ljubljana every year to visit his family.
Im Kurs haben wir gelernt, dass ein Pole, ein Tscheche und ein Serbe Slawen sind.
In the course, we learned that a Pole, a Czech, and a Serb are Slavs.