〜し
and what's more, and besides
Plain form + し, (plain form + し,) …
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し after a plain form lists reasons or points that pile up: この店は安いし、おいしいし、いつも込んでいます, "this place is cheap, it's good, and it's always packed".
It often implies a conclusion: 今日は雨だし、寒いし、家にいよう, "it's raining and it's cold, so let's stay in". Even a single し suggests "among other reasons": お金もないし, "I've got no money, for one thing".
Nouns and な-adjectives keep だ: 雨だし, 静かだし.
The て-form also lists (安くておいしい), but neutrally. し adds the sense of building a case, the way English piles up "and besides".
Examples
この店は安いし、おいしいし、いつも込んでいます。
This place is cheap, it's good, and it's always packed.
今日は雨だし、寒いし、家にいよう。
It's raining and it's cold, so let's stay in.
田中さんは優しいし、頭もいい。
Tanaka's kind, and clever too.
お金もないし、今年は旅行に行きません。
I've got no money, for one thing, so no trip this year.
駅から近いし、この部屋にします。
It's close to the station and all, so I'll take this room.