The phrase "solid grounding" means having a strong foundation or understanding of something. It implies that someone or something has a firm basis of knowledge, skills, or principles to build upon. Full definition
We are aware of your feelings and concerns during this difficult time, and we focus on protecting your rights and getting you on solid ground for your future. (siplfirm.com)
On the matter of abortion, the respondents certainly had a firmer grasp of the facts, and more solid ground for thoroughly formed views. (thenewatlantis.com)
And if this happens, we are more likely to stumble and feel our way to more solid ground on an issue of almost singular importance. (crpe.org)