~てから
After doing one thing, then another
You’ll be able to make clear that one action follows only after another is complete.

宿題をしてから、テレビを見ます。
shukudai o shite kara, terebi o mimasu.
What do you think this sentence means?
I watch TV after doing my homework.
Make the order “after A, B” explicit
Use ~てから when the second action happens after the first action is completed.
手を洗ってから、ご飯を食べます。
te o aratte kara, gohan o tabemasu.
I eat after washing my hands.
First action in て-form + から
Put the first action in the て-form, add から, and then state what happens next.
朝ご飯を食べてから、学校に行きます。
asagohan o tabete kara, gakkou ni ikimasu.
I go to school after eating breakfast.
仕事が終わってから、買い物に行きます。
shigoto ga owatte kara, kaimono ni ikimasu.
I go shopping after work finishes.
日本に来てから、日本語を勉強しました。
nihon ni kite kara, nihongo o benkyou shimashita.
I studied Japanese after coming to Japan.
~て、~ vs ~てから
Plain て just lists actions in order. てから insists the first one finishes before the second begins.
~てから, only after
宿題をしてから、テレビを見ます。
shukudai o shite kara, terebi o mimasu.
I watch TV after doing my homework.
The homework is definitely done first.
~て, and then
宿題をして、テレビを見ます。
shukudai o shite, terebi o mimasu.
I do my homework and watch TV.
The order is given, but nothing insists on completion.
朝起きてから、窓を開けます。
asa okite kara, mado o akemasu.
I open the window after I wake up in the morning.
顔を洗ってから、服を着ます。
kao o aratte kara, fuku o kimasu.
I get dressed after washing my face.
新聞を買ってから、会社に行きます。
shinbun o katte kara, kaisha ni ikimasu.
I go to work after buying a newspaper.
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