noun
groundwork; solidifying the fundamentals; training of the basics
Refers to the process of establishing a firm foundation, often in learning, sports, or projects.
新しい言語を学ぶには、基礎固めが大切だ。
When learning a new language, solidifying the fundamentals is important.
シーズン前の基礎固めとして、毎日ランニングをしている
As groundwork before the season, I run every day.
土台作り also means building a foundation, but often has a more concrete or structural nuance, while 基礎固め is commonly used for abstract skills or knowledge.
Compound of 基礎 (foundation) and 固め (hardening, strengthening), from the verb 固める (to harden, to solidify).